The Mayan meaning of "where the sky is born", Sian Ka'an is a vast 1000+ square mile world heritage biosphere where flora and fauna are still wild and raw. If you are looking for the most deserted beach, come here. We suggest taking a tour, as this is when a guide adds significant value. They know areas as well as the flora and fauna, and have access to all the facilities.
One of our favorite tours is the Mayan canal snorkel tour. We know and like Eddie and Bonnie at http://edventuretours.mx/
They also have several other tours that include zip lining, off road vehicles, and some other worthy tours. As a small local company, they use only local guides and give back to the community..
Following the success of the few originals, over the past several years Eco-Parks have begun to proliferate. There are now at least 10 in the region, several of which are very commercialized. We still like the originals.
A large all encompassing, Mayan version of Disney's Epcot, this park includes a floating river, cultural performances, a Mayan cave, main shopping square, 2 chapels, Mexican wine cellars, hacienda, a Mayan village, and its own archaeological site. As its price suggests, it definitely is an all day activity; at times they comp the 2nd day..