Island Speed Ferry Cambodia is the fastest growing ferry company in Cambodia. ISF has a ferry to Koh Rong, if you are looking for the easiest way to get from Sihanoukville to Koh Rong, as well as a ferry to Koh Rong Samloem and Heaven Island. For each of these islands, their ticket price is inclusive of the return journey, which needs to be confirmed directly with the ferry staff once you reach the island. With 4 schedules every day for each route, Island Speed Ferry Cambodia is a great way to travel by boat to Koh Rong and Koh Rong Samloem.