Those based at Koh Samui 5-star hotels the likes of SAii Koh Samui must sign up for a day tour of this idyllic national park. While it may not be as popular as Ang Thong National Park, Cheow Lan Dam is no less impressive thanks to its captivating inhabitants including elephants, tigers, tapirs and several species of monkeys. Bird-watching enthusiasts will also have much to write home about after a tour of this birding paradise where hornbills, great arguses and banded pitas fly free. The national park is also home to various lizard, snake and cobra species and an artificial lake.