2. Dive Into Wonder at Great Barrier Reef National Marine Sanctuary – Florida Keys

The only living coral barrier reef in the continental United States lies off the coast of the Florida Keys.

Snorkeling or scuba diving here reveals a vibrant underwater world of tropical fish, coral formations, and shipwrecks. For those who prefer staying above water, kayaking through mangroves or paddleboarding across crystal-clear shallows offers equally memorable experiences.

The Keys combine adventure with laid-back charm. Spend the morning diving and the evening watching a sunset celebration in Key West. Few destinations blend thrill and relaxation so effortlessly.