Trunk Bay (St. John)

To some, Trunk Bay is the Mecca of beaches. You'll be hard-pressed to find another Caribbean beach with sand quite so pearly or water so truly aquamarine. And as it's cocooned by the Virgin Islands National Park, Trunk Bay still maintains its otherworldly serenity despite its constant barrage of tourists.

One TripAdvisor user notes, "Once we got to the beach, we were beyond thrilled. There are changing rooms, showers, and bathrooms on site."

Be sure to try your hand at the Underwater Trail -- a snorkeling path of coral and fish with underwater plaques along the way. Trunk Bay's water is calm enough that even young snorkelers can enjoy the experience.

There's a $4 admission fee to enjoy Trunk Bay, which closes every day at 4 p.m.