Florida's Devil's Den, right?

Devil's Den, a 50-foot-deep underground natural pool in Gainesville with brilliant blue-green water that is usually a pleasant 72 degrees, is one of the most unusual places you could ever want to take a dip. Ancient fossil beds and rock formations may be seen in the area around the sinkhole. It's no surprise that the area is so popular among vacationers interested in water sports like snorkeling and scuba diving.

Images of Lanikai Beach, on Oahu's windward shore, might make you want to go. The sight of its warm, azure waves caressing the palm-fringed white beach in person, and the experience of swimming in them, will steal your breath away. When the sun rises, it will illuminate the sea and the distant Mokulua Islands, therefore it is best to be there early.