Home to the largest expanse of virgin forest in Thailand, Kao Sok National Park is a must-visit destination for people who want to immerse themselves in the natural beauty of Thailand. The remnants of an ancient rainforest stretch across the park, which is split by a dramatic limestone mountain range. More than 5 percent of the world’s animal species can be found in this lovely national park, which also boasts networks of dirt trails, soaring waterfalls and a beautiful lake.