You’ll be surrounded by incredible water—and it’s easy to dive right in.

Choose a tropical itinerary, such as the Caribbean, Hawaii, or South Pacific, and spectacular water and sealife-rich reefs will beckon you to jump in and explore. Most cruise lines visiting island locales offer snorkel and scuba excursions. Plus, some smaller ships — notably those from Windstar, Paul Gauguin, and SeaDream — have watersports platforms at their aft, making snorkeling and kayaking a breeze.