Located in Surat Thani province, Khao Sok is one of the most beautiful national parks in Thailand
mainly due to Chiew Lan lake and its limestone peaks planted in water that many compare to the famous Halong Bay in Vietnam. Here you can make interesting treks and discover waterfalls, amazing caves and of course all kinds of plants and animals.
The Khao Sok National Park, established in 1981, manages, with 739 square kilometes the largest rainforest in southern Thailand. Its jungle is one of the oldest rainforests in the world, it is even older and more diverse than the Amazon rainforest. The stars of the park are the gibbons and rafflesia, the biggest flower in the world.
If you come to Khao Sok, you need to take a boat tour on Chiew Lan lake, formed by Ratchaprapha dam. And I advise you to spend at least one night in a floating hotels on the lake.
If Khao Sok National Park is open year-round, from June to September, the occasional heavy downpours make the jungle unsafe but you can still enjoy the lake, its setting and all the related activities (kayaking, boat trips, paddle ect ...)
I recommend thistour in Khao Sok that I peronnally tested. I had the chance to see wild elephants thanks to the guide who knows where and when there is a good chance to find them.