Ecotourism is alive and kicking on St. John. There's more than enough to do on land, from watching for wildlife in the national park to hiking miles of trails or strolling sandy white beaches. Hit the water for amazing snorkeling, swimming, even underwater photography—of course. This is the Caribbean, after all.

In St. John's, the capital city of Antigua, farmers markets, candy- colored architecture and the ruins of sugar plantations vie for attention with a kaleidoscope of coral reefs and sailing adventures. Salute the white baroque towers of St. John's Cathedral that dominate the skyline before joining the flocks of cruise passengers on a Heritage Quay shopping excursion. To experience the island's early cultures, visit the Museum of Antigua and Barbuda, housed in a 1750s colonial courthouse.

The capital and home of the Prince of Liechtenstein, Vaduz has a car-free center, allowing tourists the freedom to walk around freely, appreciating some of the many surviving medieval, Gothic, and Baroque structures. Older buildings stand next to more recent structures, like the black basalt cube that showcases the contemporary and modern art collection of the Liechtenstein Museum of Fine Arts. Vaduz Castle, the home of the royal family, overlooks the city from the hills that surround the city.