Impian Divers Activity Center (tel. 035-313-912; www.impiandivers.com) is a dive operator offering snorkeling, fun dives, scuba diving, introduction dives, reef cleaning, and environmental projects. They include free accommodations at Champa Koh Kong Guesthouse for those doing dive courses. They also organize mangrove forest and waterfall tours and organized motorcycle trips.
Koh Kong Divers (tel. 017/502-784; www.kohkongdivers.com) is the first PADI scuba diving operation in Koh Kong. They have a range of courses to suit all levels of skill and organize dive trips to local islands and reefs as well as multiday excursions. They also offer snorkeling and island tours, waterfall trips, and jungle adventures. Their office is located on the riverfront road next to the Koh Kong Guesthouse. They can also be contacted through the Barracuda Beach Bar on Koh Yor Beach.