How often do you get the chance to walk through a tunnel of lava? Created by the flowing and cooling process of liquid magma, the underground lava tubes of Santa Cruz are simply breathtaking. The most popular is the Tunnel of Love, so named for the heart-shaped hole in the ceiling. Cool down with a splash in the fresh waters of Puerto Ayora, snorkel at Tortuga Bay or the mangrove-lined Garrapatero Beach and get friendly with the giant natives at the El Chato Tortoise Reserve.

Bournemouth’s seven miles of beach and exceptionally warm microclimate make it a favorite of U.K. travelers. There’s something for everyone here, whether you’re a watersports fanatic (try surfing lessons!) or just want to let your kids splash around in the calm waters. For a traditional Bournemouth vacation, rent a classic beach hut.

Milan is the prime draw in Italy's most prosperous province. The Cathedral, La Scala opera house and Santa Maria delle Grazie, home of da Vinci's "Last Supper," are just some of the sights. Equally fascinating is the belle Epoque splendor of 19th-century Galleria Vittorio Emanuele II. When not on one of its frequent strikes, Milan's Metro is an excellent way to explore. Renting a car opens up the region, with its towns full of Romanesque architecture and the peninsula of Sirmione and "Gardesana" coast.