One of the world's oldest rainforests — limestone towers, a jungle river, floating raft houses on an emerald lake, and gibbons for an alarm clock.
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Khao Sok National Park protects a slab of rainforest often reckoned among the oldest on Earth — a dripping, hooting, orchid-hung jungle piled around limestone mountains in the interior of southern Thailand. The little village of Khlong Sok sits at the park entrance, a strip of lodges, tour offices and cafés on the Sok river about 1½–2 hours from Surat Thani.
For anyone doing the Gulf coast, Khao Sok is the great inland detour: swap the beach for a couple of nights of jungle treks, tubing down the river, and — the real showstopper — a night in a floating raft house on Cheow Lan lake, where limestone towers rise sheer from emerald water and gibbons call across the morning mist.
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From Ban Krut, ride the southern line to Surat Thani — around four hours on the train, and the same railway you'd take for Koh Samui or Koh Phangan. From Surat Thani town, the train station at Phun Phin, or the airport, minivans run to Khao Sok in about 1½–2 hours; any travel desk or online booking will include hotel drop-off in Khlong Sok.
Coming from the Andaman side instead, minivans reach Khao Sok from Khao Lak in about an hour and from Phuket in two to three — which makes the park an easy hinge point between the two coasts.
For Cheow Lan lake, transfers continue about an hour east of the village to the Ratchaprapha dam pier, where longtail boats head out to the raft houses. Lake overnights are sold as packages with boat, meals and guiding included.

The flooded valley behind Ratchaprapha dam is Khao Sok's masterpiece: emerald water, sheer limestone towers and drowned forest. Even a single day trip by longtail boat is unforgettable.

Rows of simple floating bungalows moored under the cliffs — you swim off your doorstep, kayak at dusk and wake to mist and gibbon song. Basic huts and plusher floating villas both exist.

Guides lead half- and full-day treks from the village into the park — waterfalls, hornbills, maybe wild elephants' calling cards — and after dark, night walks reveal a different forest entirely.

Drift the slow, tea-coloured river under overhanging jungle by canoe or inner tube — monitor lizards on the banks, kingfishers overhead, and a swim wherever you fancy.

Boat safaris on the lake weave between limestone islets to viewpoints, caves and coral-shaped crags, with langurs, hornbills and eagles along the shore — best in early morning light.

The village itself is a likeable strip of cafés, smoothie shacks and tour offices where trekkers compare leech counts. Between activities, a hammock and a fresh coconut solve most things.
Khao Sok cooking is honest southern Thai fare for hungry hikers: fiery green and massaman curries, tom yum, stir-fries and mountains of rice, served in open-sided restaurants to a soundtrack of cicadas. Portions are generous and menus mercifully tourist-legible.
On the lake, raft-house stays include family-style Thai meals — whole fried fish, curries, fruit — eaten on the pontoon as the light goes off the cliffs. Back in the village, a few cafés do good breakfasts, real coffee and banana pancakes.

Khlong Sok is a jungle village, not a market town — expect a handful of evening food stalls and minimarts along the main strip rather than a proper night bazaar. What's there is cheap and cheerful: grilled chicken, pad thai, roti and fruit shakes.
The real market action is back in Surat Thani, whose morning and night markets are worth an hour if your connection allows — otherwise stock up on snacks, water and insect repellent in the village before heading to the lake, where there are no shops at all.

Khao Sok splits its sleeping between the river village and the lake — and the classic itinerary combines both. Riverside lodges make the treks easy; a night afloat on Cheow Lan is the memory you'll keep.
Bungalows and treehouse rooms line the Sok river at the park entrance — falling asleep to the river and waking to hornbills, with treks and tubing on the doorstep.
On Cheow Lan lake, simple floating huts and smarter floating villas are booked as packages with boat transfer, meals and guided outings included — one night is magic, two is better.
A handful of high-end tented camps and jungle resorts add pools, proper beds and guided-everything comfort — safari style, deep in the oldest forest you'll ever sleep in.
Step-by-step transport guides for this stretch of the Gulf coast.