Things to do in Koh Tao.

Koh Tao's single most photographed sight: three small islets joined by a natural sand spit, a short longtail boat ride from Mae Haad or Sairee. The island is privately managed by the resort based there and charges a cash entrance fee at the pier — commonly quoted around 100 baht per person on a same-day boat trip, though some tour operators and recent visitor reports put the resort's own day-visitor rate closer to 200-250 baht adult / 100-120 baht child, so treat the lower figure as a floor rather than a guarantee and budget for the higher one. Single-use plastic bottles are confiscated at check-in (bring a reusable one), and fins and water shoes are barred in the water to protect the coral. A steep staircase climbs to the viewpoint over the twin bays and sandbar below; the surrounding shallow reef doubles as a snorkel stop and a dive site (Twins, Japanese Gardens, Green Rock and Red Rock all sit just offshore) — arrive early or late to beat the day-tripper boats from Koh Samui and Koh Phangan.

A headland trail above Chalok Baan Kao on the south coast climbs to a panoramic lookout over two adjoining bays at once — genuinely one of the best free views on the island. Access runs through the same gate as Freedom Beach, and reports of the fee vary by who is on duty: some visitors are charged a combined 50-100 baht entry covering both the viewpoint and the beach, others (especially before roughly 8-9am, when the gate isn't staffed yet) pay nothing beyond a token parking charge for a scooter. The path itself is short but steep and rocky in places, best tackled in the cooler morning hours with proper shoes rather than beach sandals.

A sheltered bay near Chalok Baan Kao named for the blacktip reef sharks that patrol its shallows — a reliable, low-effort spot to see sharks while snorkeling straight off the beach. The main access point is through Haad Tien Beach Resort, which charges a 100 baht entry fee per person for its beach and restaurant; a smaller, free public cove sits alongside it and reaches the same snorkelling water without the resort fee, or you can walk in from Mae Haad village (roughly 30 minutes) at no cost at all.

A calm, coral-fringed bay reachable by longtail boat from Mae Haad or Sairee, popular for snorkeling day trips thanks to shallow, protected water and healthy shallow reef right off the sand. There's no separate entrance fee to the bay itself — it's usually bundled as a free stop on the same multi-site boat trip as Nang Yuan and Hin Wong Bay (see the snorkeling day-trip pricing below), rather than booked on its own.

Rocky, undeveloped coves on the southwest and east coasts, favoured by the island's small wellness community, with some of Koh Tao's best sunset viewpoints and a handful of low-key guesthouses rather than resorts — a genuinely quiet alternative to Sairee's beach-bar scene. Freedom Beach shares its access gate (and the same variable 50-100 baht fee) with John-Suwan Viewpoint above it.

Koh Tao has one of the highest concentrations of PADI 5-star dive centres of any island in the world, and course pricing is competitive between them: a 3-4 day Open Water course typically runs roughly 9,900-12,950 baht depending on the shop, usually including the e-learning manual, all equipment rental, boat trips, insurance and the certification fee, with no extra costs beyond that quoted price. It's realistic to complete Open Water, Advanced and Rescue courses back to back, and many long-stayers arrive for a single course and stay on through Divemaster or Instructor training.

Koh Tao's two best-known deeper dive sites. Chumphon Pinnacle sits about 10km northwest of the island, a submerged granite pinnacle that different operators measure slightly differently but which broadly runs from a shallowest point around 14m down to roughly 35-40m at its base, with typical visibility of 20-30m — expect big schools of barracuda and trevally, resident groupers and occasional in-season whale shark sightings. Southwest Pinnacle sits roughly 45 minutes southwest by boat, shallower and more compact at about 5m to 30m (average around 20m). Both suit Advanced Open Water divers and above rather than first-timers.

A former WWII-era US Navy landing craft handed to the Royal Thai Navy after the war and deliberately sunk off the southwest coast on 18 June 2011 to create an artificial reef and diver-training site. The 48-metre wreck sits upright at a maximum depth of about 30m, with its highest point (the mast) reaching up to roughly 18m — within range for divers holding at least an Advanced Open Water certification, or a Wreck Specialty course run on the site itself. It's often paired on the same boat trip with the shallower Twins reef site nearby.

Koh Tao has two long-established, purpose-built freediving centres: Apnea Total, founded in 2004 as the first freediving school in Southeast Asia and still headquartered on the island, and Blue Immersion, which trains on the SSI system. Between the island's schools, courses run the AIDA, SSI, PADI, RAID and Molchanovs systems from beginner through instructor level — a genuine alternative for days off the dive boat.

A smaller but real climbing scene on the limestone outcrops near Sairee and the island's southern headlands, anchored by two named operators: Goodtime Adventures, climbing and guiding on the island since 2008 with 200+ bolted routes, and The Bunker Koh Tao, a combined climbing centre, hostel and café running guided climbs and courses for all levels.

A network of dirt trails climbs the island's hilly interior to a handful of paid viewpoint bars. Fraggle Rock charges a 100 baht entrance (covering both the main platform and a nearby bamboo lookout), reached by a roughly 5-minute walk from the Exotic Hive restaurant trailhead; Mango Viewpoint charges the same 100 baht, with a small restaurant and juice bar on the hillside to make a sunset stop of it. Trails can be steep and slippery after rain, so go with decent footwear and daylight to spare.

Koh Tao's longest beach carries the island's main strip of restaurants, beach bars and low-key nightlife, including regular fire shows on the sand — busier and more social than anywhere else on the island, and the natural evening base for long-stay divers and instructors.

The pier town runs on ferry schedules and dive-shop routines rather than tourist crowds — banks, 7-Elevens and simple Thai food stalls make it the best stop for cheap, authentic eating and a look at the island's working rhythm away from the beach bars.

The south coast's calmer second hub trades Sairee's density for a more relaxed resort- and bungalow-restaurant scene, within easy reach of Shark Bay and the John-Suwan viewpoint for a quieter day-into-evening loop.

What are the best things to do on Koh Tao?

Diving is the headline draw — Chumphon Pinnacle, Southwest Pinnacle and the HTMS Sattakut wreck are the standout sites — but the island also has the Koh Nang Yuan sandbar day trip, the John-Suwan and Mango viewpoints, Shark Bay snorkeling with blacktip reef sharks, freediving and rock-climbing schools, and Sairee Beach's restaurant and nightlife strip for the evenings.

Is Koh Tao only for divers?

No, though diving is central to the island's identity and economy. Non-divers can snorkel at Shark Bay, Mango Bay or Koh Nang Yuan, hike to viewpoints like John-Suwan and Mango Viewpoint, try freediving or rock climbing, or simply enjoy Sairee Beach's restaurants and beach bars — Koh Tao just has fewer big-resort, non-diving amenities than Koh Samui or Phuket.

What is Koh Nang Yuan Island, and how much does it cost to visit?

A small cluster of three islets joined by a natural sand spit just off Koh Tao's northwest coast, reachable by a short longtail boat ride from Mae Haad or Sairee. The island is privately run by its own resort and charges a cash entrance fee at the pier — figures reported by visitors and tour operators range from around 100 baht up to 200-250 baht per adult (100-120 baht for children), so bring more than the lower figure. A steep staircase climbs to a viewpoint over the sandbar and twin bays, single-use plastic bottles are taken at check-in, and fins/water shoes aren't allowed in the water to protect the coral — go early to avoid the midday day-tripper boats from Koh Samui.

Are there hiking trails on Koh Tao, and do the viewpoints charge an entrance fee?

Yes — a network of dirt trails climbs the hilly interior to viewpoints such as Mango Viewpoint, Fraggle Rock Viewpoint and John-Suwan Viewpoint above Chalok Baan Kao. Fraggle Rock and Mango Viewpoint each charge a 100 baht entrance fee (each has a small bar or restaurant on site); John-Suwan's fee is less consistent, commonly 50-100 baht covering both the viewpoint and Freedom Beach below it, occasionally free if you arrive before the gate is staffed in the early morning. Trails are unpaved and can be steep or slippery after rain, so proper footwear and daylight matter.

Is Koh Tao good for snorkeling without diving?

Yes. Shark Bay (Ao Thian Ok) near Chalok Baan Kao reliably shows blacktip reef sharks in the shallows (100 baht via the Haad Tien Beach Resort access point, or free via the public cove alongside it), Mango Bay and Koh Nang Yuan both have healthy shallow reef close to shore, and boat operators run half- and full-day multi-stop snorkeling trips — typically 800-1,500 baht for a full day covering four to five sites with lunch, gear and a guide included — without any dive certification required. Koh Nang Yuan's own entrance fee is charged separately from the boat trip price.

How much does it cost to learn to dive on Koh Tao?

A PADI Open Water course typically runs about 9,900-12,950 baht across the island's dive shops, usually for a 3-4 day course including the e-learning manual, all equipment rental, boat trips, dive insurance and the certification fee — accommodation is usually separate. It's genuinely one of the more affordable places in the world to get certified, which is a large part of why Koh Tao has such a dense cluster of dive centres.