Turtle Island, Cambodia offers 1 beach perfect for sunbathing, surfing, swimming, and more. Turtle Island, Koh Sdach, Cambodia, is known for its vibrant marine life and excellent snorkeling and diving opportunities. The best time to travel to Turtle Island, Cambodia, is from November to February, with average air temperatures around 25-30°C (77-86°F) and water temperatures around 28°C (82°F). Sandee provides detailed maps, photos, and reviews from fellow beachgoers to help you Choose Your Beach™ and plan your perfect beach vacation!