The Riviera Maya Mexico region spans 100 miles along the Caribbean Sea, from Cancún south to the Sian Ka'an Biosphere Reserve. Visitors go for the nature reserves, snorkeling, Maya ruins or to just relax on the white beaches.

Take highway 307 south along the shore There's a thriving eco-tourism market on the Riviera Maya, many opportunities to swim with dolphins, cave diving or explore the mangrove swamps.

Centos - Natural wonders of the state of Yucatan are innumerable and some of the most important and unusual are the cenotes or sink holes. In the Yucatan there are over 3001 cenotes, with only 1400 actually studied and registered.

There are four types of cenotes completely underground, those that are semi-underground, those that are at land level like a lake or pond, and those that are open wells, like the one in by Chichen Itza. Some of them are accessible for swimming and cave diving,

but this is a sport that should only be practiced with a professional guide.

Cenote Ik Kil - Located in the Eco-archeological Park Ik Kil, just 1.8 miles from Chichen Itza and Pista. Called the "Sacred Blue Cenote," it is a perfectly round well-type cenote with exuberant vegetation and waterfalls. This is another ideal place for swimming in the clear blue water. 196 feet wide and about 130 feet deep, it is an open cenote about 85 feet from the surface. A grand stairway leads you down the steps into the water.

Entrance is 35 pesos and it is open daily from 8 AM to 6 PM. There is also an excellent buffet style restaurant here and bungalows for overnight stay.