Sian Ka'an Biosphere Reserve:
Over a million acres nature reserve, made up of about one-third wetlands, one-third tropical forest and one-third marine systems, a UNESCO World Heritage site. The reserve maintains ecological diversity while it provides the native population with agricultural and ecological opportunities to make a living. Friends of Sian Ka'an is a non-profit group that operates biologist-escorted tours from Cancún that help the biosphere concept support itself via low-impact tourism.

Other out of the way Islands to enjoy the Natural Beauty are:

Cozumel Island:
Cozumel has the distinction of being the largest island in Mexico as well as the largest cruise ship port. It has an exciting combination of casual sophistication and magnificence. Located two hours south of Cancún, Cozumel is a flat island with an interior covered by dense jungle, and marshy lagoons. On the western side are white sandy beaches with calm waters where you can snorkel, sail, windsurf or scuba dive. There is horseback riding on the beach. Eastern side beaches are deserted stretches of sand with dramatic rock formations and powerful surfs - a favorite place to surf or boogie board. The Mayans built a temple on Cozumel to their moon goddess, Ixchel, to ensure fertility for their women.

Isla Holbox:
There is no better place to get away from it all than on Isla Holbox. This small island 16 mi long rests at the tip of Quintana Roo, just north of Cancún and offers a kind of romance and tranquility. The small village has no paved roads and the residents get around on electric golf carts. On the gulf side of the island are long stretches of sand, where the birds gather to bask in the sun. It's a beachcomber's paradise - the sands are strewn with hundreds of seashells. Afternoon breezes from the Gulf of Mexico ensure that the island remains cool. the checkpoint station, turn north to Kantunilkin road.