Monkey Beach, locally known as Yong Kasem Bay, is a small, shallow cove inhabited by wild long-tailed macaques. Located near the entrance to Dalum Bay on the western side of Phi Phi Don, it's a popular snorkeling spot with a fascinating coral reef about 50 meters offshore. While you can feed and watch the monkeys, use caution — they can become aggressive when hungry and are known to snatch bags and cameras.