Some believe that the amazing lowland jungle dates back 160 million years, making it one of the world's oldest rainforests and Khao Sok National Park, being one of the most popular national parks is a definite must see when exploring the exotic Thailand. The park is a rainforest with great diversity of plants and wildlife featuring awesome spots such as Cheow Lan Lake, iconic limestone hills, waterfalls, raft houses spread over the lake, trails, caves and rivers.