See the underwater world around Cancun aboard the Reef Express, which straddles the line between glass-bottomed boat and yellow submarine. The relaxing 2-hour cruise takes you through the Nichupté lagoon out to the Cancun Underwater Museum and the coral reef, a scenic experience for all ages.

Board the vessel at Aquaworld's marina, grab a soft drink or a beer, and get your camera ready for some spectacular views. The underwater windows along the boat's hull give you an up-close look at some submerged sculptures on the ocean floor, part of a unique museum created by British artist Jason deCaires Taylor.

Cruise on to the Punta Nizuc area for a look at the vivid coral reef, and see the wide variety of tropical fish, turtles, and undersea life that inhabits the shelf as they swim by just outside.