What should I know before visiting Koh Samui?

Direct answer

Koh Samui is a popular Thai island offering beaches, temples, nightlife, and outdoor activities. Plan for weather variability, boat/flight connections, and local customs to make the most of your trip.

Visa / Entry Requirements

• Many nationalities receive a 30-day visa exemption on arrival (Thailand); some get 15/90 days—check with your embassy before travel.
• Passport must be valid for at least 6 months on arrival; carry return/onward ticket proof and sufficient funds if asked.
• For stays longer than the visa-free period, apply for a visa in advance or extend at the local immigration office in Thailand.

Best Time to Visit

• Ideal: December to April — dry season, warm seas, calm weather.
• Shoulder months: November and May — possible rain but fewer crowds and lower prices.
• Wet season: September–October (and occasional storms in October) — expect heavier rains and rough seas; some tours may be canceled.

Safety Tips

• Swim only at lifeguarded/marked beaches; currents can be strong, especially during monsoon.
• Watch out for scooter accidents — helmets are mandatory and roads can be narrow/steep. Rent from reputable vendors; inspect brakes/lights.
• Beware of petty theft; use hotel safes for valuables and avoid leaving things unattended on beaches.
• Tap water isn’t safe to drink; use bottled or filtered water.

Local Customs & Etiquette

• Respect the Thai Royal Family; criticism is illegal and culturally offensive.
• Dress modestly when visiting temples: shoulders and knees covered; remove shoes before entering buildings.
• Use polite greetings (wai) and a soft tone; point with the whole hand rather than a single finger.
• Negotiation: haggling is common in markets but do so politely.

Currency & Money

• Currency: Thai Baht (THB). Cash is king for markets, small vendors, and taxis; ATMs are widely available in Chaweng and Lamai.
• Credit cards accepted at hotels, many restaurants, and larger shops; expect small-card-surcharge sometimes.
• Carry smaller notes for taxis, tips, and street food.

Transportation on the island

• By air: Samui Airport (USM) has domestic and some international flights; smaller aircraft and higher fares vs. mainland flights.
• Boats: ferries and speedboats connect to the mainland (Surat Thani) and nearby islands (Koh Phangan, Koh Tao). Check schedules and sea conditions.
• Local transport: taxis (meter rare; agree price first), shared minivans, songthaews (red trucks) on set routes, and rental scooters/cars.
• Driving: left-hand traffic. If renting a car/scooter, ensure valid license (International Driving Permit recommended) and insurance.

Must-Know Tips & Local Insights

• Choose area by vibe: Chaweng (lively nightlife, shopping), Lamai (mid-size, relaxed nightlife), Bophut/Fisherman’s Village (chic dining, markets), Maenam/Nathon (quieter, local life).
• Book popular activities (island-hopping, snorkeling trips, Ang Thong Marine Park) in advance during high season.
• Time your island transfers: ferries can be canceled in bad weather; allow buffer before flights.
• Health: bring basic meds, sun protection, insect repellent; consider travel insurance that covers water activities and scooter accidents.
• Eco-aware: avoid single-use plastics where possible; say no to coral-touching and support responsible tour operators.
• Nightlife & parties: Full Moon Party is on Koh Phangan; Koh Samui has beach bars and clubs—drink responsibly and watch belongings.

Practicalities

• SIM & connectivity: Buy a local SIM at the airport or kiosks for good data rates (AIS, TrueMove, DTAC). Free Wi‑Fi is common in hotels/cafes.
• Electricity: 220–240V, 50Hz; sockets typically Thai/A/C type—carry an adapter if needed.
• Tipping: Not mandatory but appreciated—small tips to service staff, round up taxi fares, 10% in restaurants if no service charge.

Quick checklist before departure

• Passport valid 6+ months, check visa rules for your nationality
• Book transfers and any high‑season activities in advance
• Travel insurance covering medical, water sports, and vehicle accidents
• International Driving Permit if you’ll rent a scooter/car
• Cash in THB and a working phone/SIM data plan

Enjoy Koh Samui — balance beach time with exploring temples, waterfalls, and nearby islands, and respect local customs for a smooth, memorable visit.