What are the best day trips from Koh Tao?

Go early. The three islets sit about 1 km off the northern tip of Sairee, and a longtail from Mae Haad pier tends to cost around 300 to 400 baht return per person, roughly $10 at 33.69 baht to the dollar. The island charges a landing fee, currently around 100 baht, and bans plastic bottles, so pour your water into a reusable flask before leaving the guesthouse. By 11am the Lomprayah tour boats arrive and the sandbar becomes a queue of selfie sticks, but at 8am the sand is still cool underfoot and the air carries salt with a little diesel from the moored longtails. You can climb the 20-minute staircase to the Nang Yuan viewpoint before the heat builds. Nang Yuan gives the history buff nothing, and its one resort cafe charges island prices, so buy lunch at a Mae Haad bakery and plan to be back by 1pm.

When one of you wants adventure and the other wants rest, the round-island snorkel boat is the better shared day. Most Koh Tao operators run a 9am to 4pm loop of roughly 20 km, usually for around 700 to 1,000 baht with a Thai lunch on board. The usual stops are Shark Bay, Ao Leuk, Ao Tanote and Ao Hin Wong, and Mango Bay on the north coast is often added. The partner who wants rest can stay under the deck awning, while the other swims with the blacktip reef sharks at Shark Bay, which tend to show up in the morning. Swell at Ao Tanote can cancel that stop between October and December. Ask whether your boat ends at Koh Nang Yuan, because some loops include it and that saves you a separate morning. Hin Wong is the quietest of the four bays, and its granite boulders get hot enough by 2pm that you will want a towel under you.

If food is the point, Koh Phangan is the day trip to make. The Lomprayah catamaran covers roughly 45 km to Thong Sala in about 1 hour 15 minutes, and fares tend to run 600 to 700 baht each way. At the Phantip market in Thong Sala, grilled squid, mango sticky rice and smoky gai yang cost 40 to 80 baht a plate, cheaper than lunch on Koh Tao. For the history buff, a taxi out to Wat Phu Khao Noi, often called the oldest temple on Phangan, takes about 15 minutes. The catch is timing. The last boat back to Mae Haad usually leaves in mid-afternoon, so check the current Lomprayah timetable the night before, or you may end up with an unplanned night on Phangan. Sail Rock, roughly halfway between the two islands, is a dive-only day, and you can expect around 3,500 baht for two dives with a Sairee dive shop.

Skip Ang Thong National Marine Park unless you both love boats. It lies roughly 75 km southwest, and the day tour from Koh Tao usually leaves around 8am and gets back near 6pm, with close to 4 hours of that spent in transit. The 42 islands and the Emerald Lake on Koh Mae Ko are worth seeing, but Koh Samui sits much closer and is the better base for them. On 9 October 2026, Koh Tao read 28.1°C under overcast skies with 73% humidity, and in that heat a 10-hour day on Gulf swell is hard on whichever of you gets seasick. If you want a sunset together without a boat, John-Suwan Mountain Viewpoint above Freedom Beach is about a 20-minute hike from Chalok Baan Kao, and the landowner charges a small entry fee, currently around 50 baht.