An excellent day trip from Koh Phangan is, the Ang Thong National Marine Park. It consists of 42 islands, with the largest being Koh Wua Talap. The national park gained a lot popularity after it became a location for the movie 'The Beach'. A great one day trip from Koh Samui, the marine park is the perfect place from where you can go diving or snorkeling to catch a glimpse of the amazing marine life. If you are in an adventurous mood, you can also climb 500 metres at Koh Wua Talab, to get a birds-eye view of the islands and the mainland.