True to its name, Hot Springs, Arkansas, is renowned for its thermal springs. Hot Springs National Park, and its hiking trails and bathing facilities, is the region’s starring attraction, while the city’s art deco architecture is another big draw for day-trippers from Little Rock.

Even the sands of Playa Conchal are special, comprised of the silky remnants of millions of crushed conch shells. Frolic, swim and snorkel in the warm, crystalline waters by day; at night, camp out on the beach under the stars. Guided rafting, adventure and nocturnal turtle-watching tours are available—and exhilarating.

If you prefer your beaches without the accompanying commercial developments, Isla de Vieques is your tanning turf, with more than 40 beaches and not one traffic light. Visit Mosquito Bay when the moon is dim to see its famous glowing water (a tiny organism is responsible for the shining effect).

If you love the beach, but also want a little culture, you'll love Christiansted, one of St Croix's two waterfront towns. Historic churches, charming courtyards, shaded walkways, stone arches, antique lampposts and rows of restored town houses add to the city's appeal. Relax on a tranquil, white-sand beach or float in the aquamarine water. Enjoy the shops, boutiques, galleries, cafés and restaurants, or visit attractions like Fort Christianvaern, the Customs House and the Old Scale House.

There's more than one way to enjoy the spa experience in St. Lucia. One is to book a treatment at any of the luxury spas or resorts on the island. The other is to visit Sulphur Springs, inside the bowl of an extinct volcano, where you're welcome to try a volcanic mud bath or the 31°C/88°F Roman bath.