Whether you're a diver or not, the one 'must see' attraction away from the beaches on Samui is the Angthong National Marine Park. This collection of 42 tiny limestone islets 31 km west of Samui sport virgin tropical rain forests, white sand beaches and coral reefs, all preserved as a national park. The park is normally visited as a day trip from Samui, operated by several agencies. Your hotel is sure to have a tour desk or nearby agency that can book a trip.
While there are some good dive sites around the park, don't miss the scenery above the waves. There are fantastic karsts, hidden lakes and an abundance of wildlife. For more information about the sights of Anthong National Marine Park, see the article at ThailandForVisitors.com, or see the tours available below.