In the south-west of Thailand, Khao Sok National Park has it all: stunning landscapes of karst (giant limestone outcrops, often in the form of tall pinnacles), rivers, waterfalls and wildlife-rich forests.
You can go rafting or kayaking, or take one of the many walking trails.
Comfortable accommodation is provided in treehouses – just the thing when there are likely to be leopards or even tigers roaming around at night.