Caye Caulker. Set inside the 1,280-acre protected Hol Chan Marine Reserve, the island of Caye Caulker is known throughout the Caribbean as a top snorkeling location. Then, you'll proceed to Shark Ray Alley, home to harmless nurse sharks and smaller rays. Stand on the sandy bottom or float and just let these gentle creatures swim by you in very close proximity.

The day is yours to spend how you wish. The crystalline water is perfect for swimming, and the beach offers a long stretch of white sand, which invites you for a stroll. Work up an appetite with an invigorating game of beach volleyball and enjoy a delicious buffet-style lunch. Barbeque chicken, hamburgers, and hot dogs are served with island-style fixings and tropical fruit. Iced tea and lemonade are available throughout the day.

Chankanaab Adventure Beach Park, located within Cozumel's National Marine Park, is a premier eco-park famous for snorkeling, scuba diving, and a protected, crystal-clear coastal lagoon. It features stunning coral reefs, underwater statues (Christ and Virgin), a botanical garden, and a sea lion show. It is a top destination for cruise visitors and families, offering dolphins, manatees, and restaurants.