5. Otres Seaside: It's a serene and peaceful Seaside Positioned a handful of kilometers down from Sihanoukville, perfect for rest and sunbathing.three. Otres Seashore - A tranquil and less crowded choice to the popular Serendipity Beach, Otres Beach is great for People seeking a calming split. The beach is lined with dining places, bars, and cafes