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Most hotels and guesthouses arrange boat trips, which include packed lunches, to the many offshore islands. Several companies offer diving and snorkeling; two of the most popular dive centers are EcoSea Dive and Scuba Nation.
EcoSea Dive. EcoSea Dive has eco-friendly instruction. Between Serendipity Beach and Golden Lions Traffic Circle, Sihanoukville. 034/934631. www.ecoseadive.com.
Scuba Nation. Scuba Nation Diving Center was Cambodia's first certified PADI dive center. Mohachai Guesthouse, Serendipity Beach Rd., Sihanoukville. 012/604680 or 034/933700. www.divecambodia.com.