Koh Rong is a tropical island nearly the coast of sihanoukville. Only 2 Hours with the boat you can visit one the cambodias most tropical and nature bungalow resorts. The return ticket is only 9.50 US $ and you can book it by the KOH RONG TRAVEL OFFICE in Sihanoukville.
The Boat goes every day at 8.30 a.m. and 1.30 p.m. from the pier in sihanoukville. If you book at KOH RONG TRAVEL OFFICE the transport with a comfortable aircon bus is included.
http://kohrong-islandtravel.com/