Than Sadet is the island's most historic natural site, a series of cascades and rock pools tumbling through jungle on the east coast inside a national park. Its name loosely means 'royal stream', and the reason is carved into the boulders: three Thai kings, Rama the Fifth, Sixth and Seventh, visited over the years and left their royal initials in the rock, marks you can still find today. That royal connection makes it a respected, almost sacred spot rather than just a swimming hole. You can cool off in the clear pools between the tiers, scramble along the boulders, and picnic in the shade. The flow is strongest just after the rainy season, from around November, and can slow to a trickle late in the dry months. Reaching it means a steep, winding road best suited to confident scooter riders, or a longtail boat from the coast. Combine it with the nearby Thong Nai Pan bays.
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