Koh Rong Island is a great place to relax, or to explore. All the bungalows on the island are right near or on the beach. You can go snorkeling, fishing, swimming and boating from right outside your door.
If you go out the back door, watch out. Kilometers of as yet unspoiled tropical jungle. No lions, tigers, or bears, but there are the usual island bugs and birds and other things to beware.
Scuba Diving and snorkeling are of course, very popular on Koh Rong. The water is very shallow, and clear for most of the year.
Restaurants abound on Koh Rong Island. Almost all are run by foreigners, many with seafood, and you can get local Khmer cooking at most places.