Dean’s Blue Hole, Long Island
You can either conquer Dean’s Blue Hole from above or below, and unless you rank among the world’s elite few underwater cave divers, you should do like me, and head for the hills. Dean’s Blue Hole is the deepest in the world. It sits neatly in a Long Island cove, surrounded by cliffs and elongated by a beach. You can hike to the ridge on a nature trail and jump in the blue hole, or snorkel on the surface and spook yourself over its watery depths. Stay at Gems at Paradise for easy access to Rainbow Cliffs.