Bida Nok are a small uninhabited islands south of Phi Phi Don which offer five different dives. Large rocks form a mountainous terrain featuring walls that drop to 30 meters, swim thrus, small inlets, sloping reefs and Giant sea fans often hiding Tiger tail seahorses. During the months of March, April and May Ornate ghost pipefish can be found. Bearded scorpion fish hide among the corals under hovering lionfish. Barracudas, Blue Fin trevallies and tuna can be seen out in the blue.