Puerto Rico is yet another Caribbean diving destination worth exploring. With a variety of reefs, walls and trenches, and even some underwater caves, there is enough off the shores of the U.S. territory to seduce both novices and expert divers alike. Like the USVI, a number of wrecks rest off the shores of Puerto Rico, further adding to the menu of dive destinations. Mona Island, a natural paradise with giant iguanas, rare avian species and coral reefs with hundreds of marine species, is also a great spot for PR-based divers. Large sea creatures like turtles, whales and dolphins occasionally make appearances in the area (especially during their migration periods). Another amazing underwater world sits near the main southern city of Ponce. Here, the thin stretch of water between the shore and the miles-deep drop-off features colorful reefs and abundant marine life. A completely different setting and set of experiences and wildlife await along the upper portions of the sea wall.