Khao Sok is a national park north of Phang Nga Bay, not far from the tourist island of Phuket.
My suggestion
Although rates may be high, I advise you to spend 1 or 2 nights in the national park. It's a chance to sleep in a floating hut on a lake, in a large adventurer's tent, or even in the trees, completely surrounded by nature.
The Khong Chiam region is still largely unaffected by tourism and, for those willing to explore it, offers spectacular scenery and the promise of peaceful days spent well away from the noise and chaos of the urban environment. With its waterfalls, cliffs and rock paintings, Pha Taem is the kind of place you simply never tire of exploring.