The Sihanoukville coast is flanked by several islands, many of them untouristed and lightly populated by Khmer fishermen, and some are accessible by boat. Koh Rong Samlem, Koh Tas, and Koh Russei are popular day-trip destinations for snorkeling and picnicking, but local guides can arrange overnight stays in rustic bungalows if you'd like to linger for a few days. Koh Rong Samlem is about two and a half hours by boat from the mainland, and there are some quiet and isolated beaches with a few basic bungalow options. The amenities vary depending where you go. The jungle interior of the island is home to some of the deadliest snakes in Cambodia. They are more afraid of you, of course, but be aware.
Sihanoukville, Preah Sihanouk, Cambodia