Legal Guidelines for Tourists Travelling to Koh Tao, Thailand [2026]

Koh Tao, often called ‘Turtle Island,’ is a popular getaway famous for its diving and snorkeling spots. However, the relaxed island vibe, beautiful scenery, and lively nightlife can make it easy to forget that Thailand operates under an exceptionally strict legal framework. And violating these rules can lead to serious legal problems. Adding to that, recent government updates have strengthened enforcement across the country, especially in areas such as immigration, tourist conduct, and marine conservation. Because of these stricter measures, understanding the rules before you arrive is more important than ever. This detailed guide explains all the essential legal guidelines so that you can stay safe, lawful, and respectful without getting into any legal trouble.

Important Laws to Follow in Koh Tao to Stay Out of Any Trouble

In Koh Tao, Thailand, even minor violations can result in fines, penalties, or legal complications that can easily ruin your trip. Taking a few minutes to familiarise yourself with the rules will help you avoid unnecessary trouble and ensure a smooth, stress-free stay.

Below are the most important laws every visitor should keep in mind.

1. Entry, Visa & Immigration Rules

All Thai immigration rules, including visa exemption, Visa on Arrival, tourist visas, extensions, entry conditions, and overstay penalties, apply in Koh Tao in the same way they apply elsewhere in Thailand. 

Since 1 May 2025, foreign travellers entering Thailand by air, land, or sea must complete the free Thailand Digital Arrival Card online within three days before arrival. 

Passport Requirements – Your passport should generally be valid for at least six months from the date you arrive in Thailand and should contain at least two blank pages. Although some Thai consulates mention one blank visa page, several official Thai embassy pages require two pages for visa processing and immigration stamps. Two is therefore the safer general recommendation.

Airlines and immigration officers may refuse travel or entry when a passport does not meet the applicable requirements.

Visa Exemption – As of July 2026, travellers holding passports from eligible countries can still enter Thailand for tourism without obtaining a visa in advance and may generally stay for up to 60 days. They may also apply for an extension of up to 30 additional days, although approval is entirely at the discretion of Thai Immigration.

However, Thailand’s Cabinet approved changes on 19 May 2026 that would end the existing 60-day visa-exemption scheme. Under the approved framework, citizens of 54 eligible countries and territories would generally receive a 30-day visa-exempt stay, while travellers from three other eligible countries or territories would receive 15 days. En BBC also reported the planned reduction in visa-free stays.

Visa on Arrival –  Visa on Arrival is available only to passport holders from eligible countries. The permitted stay, application fee, required documents, and entry conditions can change, so travellers should confirm their eligibility through an official Royal Thai Embassy or Consulate before travelling.

NOTE – Visa on Arrival is different from visa-exempt entry.

Thailand Tourist Visa – If you’re not eligible for Visa Exemption or Visa on Arrival, or you want a longer stay, you need to apply for a Tourist Visa before you travel.

Applications should be made through the official Thailand e-Visa portal or the Royal Thai Embassy or Consulate responsible for your place of application. Documents and eligibility requirements can vary by nationality and application location. 

These are of two types:

• Single-Entry Tourist Visa

1. Valid for one entry.
2. Allows you to stay for 60 days.
3. You may be able to apply for an additional 30-day extension.

• Multiple-Entry Tourist Visa

1. Generally valid for six months.
2. Allows multiple entries during the visa’s validity period.
3. Each permitted stay is normally determined at immigration.
4. Usually requires additional financial and supporting documents for multiple entries.

Proof of Funds for Entering Thailand – On 6 July 2026, the Tourism Authority of Thailand issued a reminder that foreign visitors may be asked to show evidence that they have sufficient funds during immigration screening. TAT NEWS clarified that this is a long-standing immigration requirement and not a newly introduced rule. 

The proof-of-funds requirement has existed under Thai immigration regulations since 1980, while the currently listed financial amounts were established under a later Ministry of Interior announcement in 2000. Immigration officers may apply the requirement when assessing whether a visitor meets Thailand’s entry conditions.

The required amounts depend on the traveller’s entry category:

• Transit Visa and certain visa-exempt cases: 10,000 THB per person or 20,000 THB per family
• Visa on Arrival: 10,000 THB per person or 20,000 THB per family
• Tourist Visa: 20,000 THB per person or 40,000 THB per family
• Non-Immigrant Visa: 20,000 THB per person or 40,000 THB per family

Accommodation and Onward Travel –  Immigration officers may also ask for accommodation details, onward-travel evidence, or other documents relevant to the traveller’s entry category. The final decision on admission always rests with the Immigration Bureau officer at the checkpoint.

The Risk of Overstaying – Remaining in Thailand after your permitted stay expires is an offence under Thai immigration law and may result in fines, detention, deportation, and restrictions on returning to Thailand.

The standard overstay fine is 500 THB per day, up to a maximum of 20,000 THB. The re-entry ban depends on the length of the overstay and whether the traveller voluntarily reports the overstay when leaving Thailand or is arrested and prosecuted.

NOTE – The re-entry ban period generally begins from the date the traveller departs Thailand. A person who is discovered or arrested while overstaying may also face detention and deportation at their own expense. 

2. Drug Laws & Controlled Substances

Thailand enforces strict laws relating to illegal drugs, controlled substances, cannabis, and electronic cigarettes. Penalties can include substantial fines, imprisonment, detention, and, for certain serious drug offences, the death penalty.

Is Cannabis Legal for Tourists in Thailand?

Cannabis flower in Thailand has been classified as a controlled substance since 23 June 2025, and recreational use, purchase and possession remain illegal. Tourists may buy, use, carry or transport cannabis flower only when they have a valid prescription issued in Thailand by an authorised medical professional. The quantity supplied must be medically necessary and cannot exceed a 30-day supply.

The official tourist guidance does not specify one universal fine or prison sentence for every case of unauthorised cannabis purchase, possession or use. The charge and penalty can depend on the product, its THC content, the amount involved and the circumstances. Therefore, tourists should not assume that cannabis is legal simply because it is openly displayed or offered by a shop. 

Penalty for Smoking Cannabis in Public – Smoking cannabis in public is prohibited and may be treated as causing a public nuisance. The published penalty may include: 

• Imprisonment for up to three months
• A fine of up to 25,000 THB
• Or both imprisonment and a fine

This can apply when cannabis smoke or odour disturbs other people in streets, beaches, parks, markets, accommodation or other shared public areas.

Penalties for Taking Cannabis Out of Thailand – It is illegal to take cannabis out of Thailand without the required export permission, even when it was purchased in Thailand or obtained for medical purposes.

Current government travel guidance warns that attempting to export cannabis can lead to confiscation and fines starting at 30,000 THB per kilogram. A person who cannot pay may be detained or imprisoned and may also be placed on an immigration watchlist, affecting future travel to Thailand. 

NOTE – Cannabis may also be illegal in the traveller’s destination country or at an international transit airport. Carrying it across an international border can result in arrest, prosecution and lengthy imprisonment under the laws of the destination or transit country. 

Narcotics and Other Controlled Drugs

Thailand’s narcotics laws apply to substances such as heroin, cocaine, methamphetamine, including yaba tablets and crystal methamphetamine or “ice” and MDMA or ecstasy. Possession, consumption, production, importation, exportation and distribution are separate offences, and the penalty depends on the drug’s legal schedule, quantity, intended purpose and circumstances.

Under Thailand’s Narcotics Code:

• Unauthorised consumption of covered narcotic drugs or controlled psychotropic substances can result in imprisonment for up to one year, a fine of up to 20,000 THB, or both.
• Possessing a covered narcotic or psychotropic substance for personal consumption can result in imprisonment for up to two years, a fine of up to 40,000 THB, or both.

NOTE – Thai courts may consider treatment or rehabilitation in some personal-use cases, but tourists should not interpret this as immunity from arrest, prosecution or punishment. The court considers factors including the substance, amount, frequency of use, the person’s conduct and the circumstances of the case. 

Penalties for Serious Possession and Drug Trafficking – Penalties become significantly more severe when possession is not treated as possession for personal consumption or when the offence involves production, sale, importation, exportation or distribution. 

For Schedule I narcotics, the Narcotics Code provides:

• For unauthorised production, import, export, distribution or possession: imprisonment for up to 15 years or a fine of up to 1.5 million THB.
• Where the offence involves trade, widespread distribution, supplying a person under 18, distribution at a school, religious place or government office, violence or a weapon: imprisonment from two to 20 years and a fine from 200,000 to 2 million THB.
• Where the offender is a leader or manager of a criminal syndicate, or the conduct affects national security or public safety: imprisonment from five years to life with a fine of 500,000 to 5 million THB, or the death penalty.

NOTE – The death penalty does not apply automatically to ordinary possession or every drug-trafficking conviction. It is legally available for the most serious aggravated offences described in the Narcotics Code. 

Are E-Cigarettes and Vapes Legal in Thailand?

E-cigarettes and vaping products should be treated as illegal in Thailand. The restrictions apply to devices carried for personal use and include vapes, disposable e-cigarettes, refillable devices, pods, e-liquids, refills and heat-not-burn devices. There is no tourist or personal-use exemption.

Bringing a Vape into Thailand – Electronic cigarettes and related products are prohibited imports. A tourist carrying one into Thailand may be investigated as an importer, even when the device is intended only for personal use.

Depending on the law and charge applied, illegal importation may result in:

• Imprisonment for up to 10 years
• A fine of up to five times the product’s value
• A Customs Act fine of up to 500,000 THB
• Confiscation of the device, containers and, in serious cases, a vehicle used to transport the products

Possessing a Vape in Thailand – Possession may be prosecuted under customs law when the person knew that the product had entered Thailand without completing the required customs formalities.

The statutory penalty can include:

• Imprisonment for up to five years
• A fine of up to four times the value of the goods
• Or both imprisonment and a fine

Using a Vape in Public – Using an electronic cigarette containing nicotine in a prohibited public-smoking area can result in a fine of up to 5,000 THB. Other customs or possession charges may also apply separately. 

Selling or Supplying Vaping Products – Selling e-cigarettes, e-liquids or related services can result in:

• Imprisonment for up to three years
• A fine of up to 600,000 THB
• Or both imprisonment and a fine

3. Alcohol & Drinking Regulations

Koh Tao is lively, but alcohol use is strictly regulated, especially regarding age and sale times.

Legal Drinking Age – The legal age for purchasing and consuming alcohol is 20 years old. Visitors are advised to carry valid identification for age verification.

Purchase and Sales Hours – Effective 29 May 2026, alcoholic beverages may generally be sold in Thailand from 11:00 to 24:00. The change made the former 14:00–17:00 trial period part of the regular permitted sales window, allowing licensed retailers, restaurants and authorised venues to sell alcohol continuously from late morning until midnight.

Sales outside these hours remain restricted unless a specific legal exemption applies. Different operating conditions may apply to hotels, licensed entertainment venues, approved event spaces and areas serving international passengers at airports. Permitted hours can vary depending on the venue’s licence, location and applicable law.

NOTE – Alcohol sales may also be temporarily prohibited during elections, major Buddhist religious days or other officially announced periods. Additional temporary alcohol restrictions may apply during elections, major religious holidays, and other officially announced periods. Tourists should check notices from local authorities, shops, bars, and accommodation providers rather than assuming that normal operating hours apply every day.

4. Respecting the Monarchy – “Lèse‑Majesté” Law

This is one of the most serious laws for visitors. The Lèse-Majesté law, Section 112, is a major criminal law in Thailand.

The law forbids:

1. Defaming the monarchy
2. Insulting or threatening the King or Queen
3. Insulting or threatening the Heir-Apparent or Regent

Take care not to commit offences against the monarchy, including on social media.

Online Conduct – The law can be interpreted broadly and can apply to online posts, comments, shared articles, images, and other digital activity. Tourists should avoid posting, sharing, commenting on, or reacting to material that could be interpreted as insulting or making accusations about the monarchy.

5. Gambling, Cards & Prohibited Games

Gambling is generally illegal in Thailand, and the law applies to tourists as well as residents. Prohibited gambling can include casino-style games, poker, roulette, dominoes, coin-toss betting and card games played for money or other valuables. Limited authorised exceptions include Thailand’s official government lottery and licensed betting at certain racecourses. Thailand’s Gambling Act prohibits participation in listed gambling activities unless the particular activity has been legally authorised or licensed. 

Playing Cards – Thailand also restricts the possession of playing cards. Under Section 8 of the Playing Cards Act, a person must not possess more than 120 playing cards unless the cards were produced by or carry the official seal of Thailand’s Excise Department. 

Violating this provision can result in 

• imprisonment for up to three years, 
• a fine calculated at four times the official value of comparable cards, with a minimum fine of 500 THB or both.

6. Scooter and Motorbike Rental Rules in Thailand

Thailand’s motorcycle laws apply nationwide, including in Koh Tao. Tourists may be able to rent scooters or motorbikes easily, but a rental business handing over a vehicle does not automatically mean that the traveller is legally licensed, properly insured or competent to ride it.

For licensing purposes, the scooters commonly rented in Thailand are treated as motorcycles. A driving licence that permits only cars is not sufficient.

What Documents Do Tourists Need to Ride Legally in Thailand?

A foreign visitor riding a scooter or motorbike in Thailand should carry:

• A valid driving licence issued by their home country
• A licence category that specifically authorises them to ride motorcycles
• A valid International Driving Permit recognised in Thailand and showing the appropriate motorcycle category
• Their passport or suitable identification as required during an official check

Helmet Rules and Penalties – Thai law requires both the motorcycle rider and any passenger to wear a helmet. The rule applies even to short journeys and regardless of whether local riders appear to follow it.

A rider or passenger who does not wear a helmet may face a fine of up to 2,000 THB. A driver carrying a passenger who is not wearing a helmet may face an increased penalty.

Before accepting a rental helmet:

• Check that it fits securely
• Fasten the chin strap correctly
• Look for cracks, damaged straps or signs of a previous impact
• Request another helmet if the one provided is damaged or does not fit

NOTE – Wearing a poorly fitting or unfastened helmet may provide little protection during an accident. 

Insurance and Accident Liability – Travel insurance is not a substitute for a valid motorcycle licence or IDP. It is also not, by itself, a legal authorisation to ride.

Travellers should check that their insurance policy specifically covers:

• Riding a motorcycle or scooter in Thailand
• The engine size of the rented motorcycle
• Riding as a driver rather than only as a passenger
• Medical treatment following a motorcycle accident
• Emergency evacuation where necessary
• Third-party injury and property-damage liability, where available

Many travel-insurance policies exclude claims when the rider does not hold the correct motorcycle licence, is not wearing a helmet, is intoxicated or is riding a motorcycle with an engine capacity above the policy’s permitted limit.

Ask the rental company to explain:

• What the vehicle’s insurance covers
• What it does not cover
• The insurance excess
• Who pays for repairs after an accident
• Whether theft is covered
• Whether damage to tyres, wheels, mirrors or the underside of the scooter is excluded

Do not rely only on a verbal statement that the vehicle is “fully insured.” Ask for the terms in writing

Before Renting a Scooter or Motorbike – Before accepting the vehicle:

• Read the rental agreement carefully
• Confirm the rental price, deposit and return time
• Photograph or video the scooter from every side
• Record existing scratches, dents, broken lights and damaged mirrors
• Make sure all existing damage is written into the agreement
• Check the brakes, tyres, lights, indicators, horn and fuel level
• Confirm what happens if the scooter breaks down
• Check the insurance terms and accident excess
• Keep copies of the agreement, payment receipt and vehicle details

Photographs and videos should be taken in the rental company’s presence before the scooter is moved.

Alcohol and Unsafe Riding – Do not drink alcohol or use drugs before riding. Insurance may be invalidated when alcohol, drugs, reckless riding or another legal violation contributed to an accident.

Riders should also avoid:

• Using a mobile phone while riding
• Carrying more passengers than the motorcycle is designed for
• Riding without previous motorcycle experience
• Speeding or riding aggressively
• Riding in heavy rain or poor visibility
• Using an unfamiliar road after dark

NOTE – For official licensing information, travellers can consult Thailand’s Department of Land Transport or contact the relevant Royal Thai Embassy before departure.

7. Environmental Laws, Littering & Wildlife / Marine Protection

Protecting coral reefs, marine life and beaches is particularly important in Koh Tao. Travellers should follow Thailand’s national marine-conservation rules as well as any additional instructions issued by national parks, protected areas, local authorities, dive operators and boat crews.

Marine Protection for Divers and Snorkellers – Since 22 April 2025, Thailand has applied nationwide regulations to diving and snorkelling activities in coral-reef areas. The measures are legally enforceable under the Marine and Coastal Resources Management Act and are scheduled to remain in force for five years.

In coral-reef areas, prohibited activities include:

• Touching or making contact with coral and other marine organisms
• Moving, handling or displaying coral, marine animals or other sea life
• Feeding fish
• Standing on, kicking or otherwise damaging coral
• Stirring up sediment in a way that can damage or smother coral
• Littering or otherwise disturbing reef habitats
• Participating in underwater walking or Sea Walker activities in coral zones

Divers near coral reefs are also expected to remain at least two metres above coral heads unless their skills and supervision allow a safe approach without damaging the reef.

A tourist who ignores instructions, for example, by touching coral or refusing to comply with required safety measures, must have the activity stopped and may be reported to marine or national-park authorities. Dive operators and supervisors can also face licensing or certification consequences if they fail to enforce the rules.

These regulations apply to coral-reef activities nationwide, including relevant dive and snorkelling activities around Koh Tao. 

NOTE – These rules should not, however, be described as one blanket law applying identically to every beach, bay, and land area across the entire island. National parks, designated marine zones and other protected locations may impose additional rules.

For more information, read the Marine Conservation Koh Tao: Complete Guide to Ocean Protection. 

Sunscreen Restrictions in National Parks – Bringing or using sunscreen containing certain chemicals is prohibited inside Thailand’s national parks.

The prohibited chemicals are:

• Oxybenzone, also called Benzophenone-3 or BP-3
• Octinoxate, also called Ethylhexyl Methoxycinnamate
• 4-Methylbenzylidene Camphor, or 4-MBC
• Butylparaben

A person who brings or uses sunscreen containing any of these chemicals inside a Thai national park may face a fine of up to 100,000 THB. The restriction followed an announcement by Thailand’s Department of National Parks, Wildlife and Plant Conservation published in the Royal Thai Government Gazette on 3 August 2021.

Travellers visiting a national park should check the sunscreen’s full ingredients list before entering. Thailand’s Tourism Authority recommends considering mineral-based sunscreen containing ingredients such as zinc oxide, along with protective clothing and other measures that reduce the need for excessive sunscreen use.

This is a national park restriction. It should not be presented as a universal sunscreen law covering every part of Koh Tao.

Waste, Littering and Single-Use Plastics – Since 6 April 2022, bringing or using specified single-use plastic products and foam containers has been prohibited in Thailand’s national parks.

Restricted items include:

• Single-use plastic food containers
• Plastic cups or glasses
• Plastic straws
• Plastic spoons and forks
• Certain disposable plastic packaging and handles
• Foam or Styrofoam food containers

Violations inside a national park can carry a fine of up to 100,000 THB under Thailand’s National Parks Act.

This restriction applies inside Thailand’s national parks and should not be described as an automatic island-wide plastic ban covering every part of Koh Tao. Other protected areas, beaches, boat operators and local sites may have their own additional waste rules.

Visitors should follow signs and instructions at the specific site they are visiting, use reusable bottles and containers where possible, and never leave rubbish on beaches, boats, dive sites or in the sea. Littering in coral-reef zones is expressly prohibited under Thailand’s current diving and snorkelling regulations.

8. Dress Code, Public Decency & Cultural Respect

Thai cultural norms place strong emphasis on respectful behaviour and appropriate clothing, particularly at temples, religious buildings, royal sites, memorials and government premises. Dress requirements vary by venue, so visitors should check signs and follow instructions given by staff.

Visitors may be asked to:

• Cover their shoulders and knees
• Avoid swimwear, transparent clothing and very short clothing
• Remove shoes before entering certain religious buildings
• Remove hats or sunglasses where requested
• Avoid loud, disruptive or disrespectful behaviour

The Grand Palace in Bangkok, for example, does not permit visitors to enter wearing items such as sleeveless shirts, vests, short or transparent tops, short trousers, torn or tight trousers, cycling pants and miniskirts. These are venue-specific entry requirements and should not be described as the exact dress code for every temple in Thailand.

What happens if you are dressed inappropriately in temples in Thailand?

There is no universal criminal fine for arriving at a temple or official attraction in unsuitable clothing. Depending on the venue, visitors may:

• Be refused entry
• Be asked to cover their shoulders or knees
• Be required to change or rent suitable clothing
• Be instructed to leave the premises

Public nudity or clearly obscene public conduct is a separate legal matter. Under Section 388 of Thailand’s Criminal Code, publicly exposing the body or committing another obscene act may result in a fine of up to 5,000 THB. This penalty does not apply automatically to ordinary clothing mistakes, such as arriving at a temple in shorts or a sleeveless top.

Practical Advice for Divers & Tourists on Koh Tao

A few basic precautions can help visitors avoid legal, financial and safety problems while enjoying Koh Tao’s beaches, dive sites and nightlife.

Before Diving or Snorkelling

Listen carefully to the dive or snorkelling briefing and follow the instructions of the instructor, divemaster, boat crew and relevant authorities.

When diving or snorkelling:

• Maintain proper buoyancy and control of your fins and equipment.
• Do not touch, stand on, kick, break or collect coral.
• Do not handle, chase, move or feed fish and other marine animals.
• Do not leave rubbish in the sea or disturb reef habitats.
• Follow any additional national-park, protected-area or site-specific rules.

Under Thailand’s regulations for diving in coral-reef areas, scuba divers must generally remain at least two metres above coral heads to prevent accidental contact. Supervisors must also ensure that only divers with sufficient control are allowed to approach coral areas safely. Contact with coral and other marine organisms, feeding fish, stirring up damaging sediment and littering are prohibited in coral-reef zones.

Documents and Information to Carry

Keep a photocopy or secure digital copy of:

• Your passport photograph page
• Your visa or immigration entry details
• Your travel insurance information
• Your accommodation address and contact number
• Your dive certification, where applicable
• Your dive operator’s contact details

Current UK government travel advice states that police may ask to inspect a traveller’s passport. A copy of the passport photograph page is usually sufficient for routine identification, but a person who does not have the original may be instructed to produce it at a police station within 24 hours.

NOTE – A passport copy is not sufficient in every situation. Foreign passengers must present their original passport for domestic flights within Thailand, and the original may also be required for immigration, banking, medical or other official procedures. Keep the original passport in a secure place when it is not required, and never leave it with a scooter, motorbike or jet-ski rental business as a deposit.

Nightlife and Personal-Safety Awareness

Koh Tao has bars, restaurants and beach parties, but travellers should remain aware of Thailand’s alcohol laws and general personal-safety risks.

Official travel advice recommends that visitors:

• Do not leave drinks unattended.
• Do not accept open drinks from strangers.
• Stay with trusted companions at parties and bars.
• Arrange safe transport before drinking.
• Avoid carrying unnecessary cash or valuables.
• Secure passports, money and electronics inside their accommodation.
• Do not drink alcohol before riding a scooter or motorbike.

Drink spiking, theft, assault and alcohol-related accidents can occur in Thai tourist areas, particularly around bars and late-night events. Money and passports have also been stolen from budget hotel and hostel rooms.

What to Do if Things Go Wrong – Legal or Medical Help & Resources

Even with the best intentions, emergencies can still happen. Having the right contact numbers ready can make a big difference in how quickly you get help.

If you end up in trouble, stay calm, cooperate, and get professional assistance right away. Don’t try to handle serious legal issues on your own.

Emergency and Tourist-Assistance Numbers in Thailand

NOTE – For an immediate medical emergency, call 1669 rather than contacting the Tourist Police first. For an ongoing crime or immediate threat, call 191. The Tourist Police on 1155 can be especially helpful when a foreign visitor needs tourist-focused assistance or help communicating with other authorities.

Conclusión

Travellers should save these numbers before arriving in Thailand and also keep the contact details of their accommodation, travel insurer and dive operator readily accessible.

Travelling to Koh Tao promises an unforgettable experience with world-class diving, warm tropical weather, and welcoming local culture. But enjoying this dream trip fully depends on respecting local laws and cultural expectations.

There are eight key areas every visitor should pay close attention to:

• entry, visa, TDAC, and overstay requirements
• strict drug laws
• regulated alcohol rules
• the sensitive Lèse-Majesté law
• gambling restrictions
• legal scooter and motorbike requirements
• strict environmental protection laws and local customs
• Dress code, public decency & cultural respect

By following Thai entry rules, respecting local laws, protecting the marine environment, and choosing a responsible dive centre such as Buceo en La Bombona, you can enjoy Koh Tao safely and responsibly while helping preserve the environment and culture that make the island  unique.

Frequently Asked Questions (FAQs)