A little granite island with world-famous dive schools, turquoise bays and hilltop viewpoints — just a ferry ride from Chumphon, down the coast from Ban Krut.
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Koh Tao — Turtle Island — is where the world learns to dive. The little island certifies more new divers than almost anywhere on earth, thanks to calm, warm, shallow bays stocked with reef fish, turtles and (harmless) blacktip sharks, and dive schools that keep prices among the lowest anywhere.
Above water it's just as good: a laid-back main strip at Sairee, granite viewpoints over impossibly blue water, and the postcard triple-bay of Koh Nang Yuan just offshore. It's the closest of the Gulf islands to Ban Krut, via the ferry pier at Chumphon.
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Koh Tao is the easiest island to reach from Ban Krut. Take a southbound train to Chumphon (around 2 hours), then a ferry from the piers just outside town. Lomprayah's high-speed catamarans do the crossing in about 1½–2 hours; slower boats take 2–3 hours and cost less.
Combined train-and-ferry or bus-and-ferry tickets through 12go or Lomprayah include the transfer between Chumphon station and the pier — worth it, as the pier is 30–40 minutes out of town.
The night boat from Chumphon is the budget adventure: leave near midnight, sleep on a mattress on deck, wake up at the island at dawn.

Three islets joined by a white sandbar, with the Gulf's most famous viewpoint above. Take a longtail from Sairee, arrive before 10 am, and snorkel the Japanese Gardens reef.

The island's social heart: two kilometres of sand with dive schools, beach bars and hammocks, facing squarely into the sunset.

Open Water courses run daily year-round; if you'd rather stay on the surface, round-island snorkel trips hit Shark Bay, Mango Bay and Hin Wong in a day.

A short scramble from Freedom Beach to the island's best panorama: Chalok Bay on one side, Shark Bay on the other, and blue in every direction.

Blacktip reef sharks cruise the shallows here most mornings — swim out calmly at high tide and you'll likely see them within minutes. They're small and completely uninterested in you.

The little port town keeps the island's everyday life — good cafés, cheap kitchens — and the southern capes hide quiet coves like Sai Nuan reached by coastal footpath.
Koh Tao eats well for its size: big breakfasts and flat whites for the dive crowd, grilled fish barbecues on Sairee at sunset, and honest Thai kitchens in Mae Haad where the boat crews eat pad krapow between crossings.
Evenings centre on the beach — fire shows, cold Changs and fresh catch on ice. For something quieter, the restaurants up on the viewpoint roads serve dinner with the whole island glittering below.

Koh Tao is too small for big night markets, but Mae Haad and Sairee village fill the gap: walking lanes lined with grill stands, roti carts, juice stalls and little shops selling sarongs and dive gear.
The real evening ritual is simpler — a beanbag on Sairee sand, a mango shake or a beer, and the longtail boats silhouetted against the Gulf's best sunsets.

Distances are small, but the vibe changes fast between bays — party, chill or castaway, pick your cove.
Dive resorts, hostels and beach bungalows on the main strip — walk to everything, including your morning boat dive.
The quieter family end: calm swimming bays, viewpoint restaurants and small resorts above Shark Bay's snorkelling.
Tanote, Hin Wong and Mango Bay are for switching off — reef at your doorstep, generator electricity, stars at night.
Step-by-step transport guides for this stretch of the Gulf coast.