Hike to one of the blue holes located on the interior of the island and go for a swim or you might get lucky and get to feed some of the turtles that live there. Blue holes are bodies of freshwater that communicate with the ocean through long underground tunnels.
A must see on Cat Island is Mt. Alvernia, a small stone, medieval-style monastery that Father Jerome built in 1939. This is the highest point in all of the Bahamas with absolutely stunning views of the ocean from every direction. Father Jerome built this retreat so that he could get away from the world. Going up the hill to the monastery, visitors will sense his religious devotion and see his beautiful and detailed work, including hand-carved stone reliefs of the Stations of the Cross.