Mexico’s third largest biosphere reserve is near Cancun.  Here you’ll find bird sanctuaries and a spider monkey refuge. The most popular parks in this area are Xcaret, Xel-Ha, Tres-Rios and Garrafon.  At many of these parks you can swim, snorkel, scuba dive, swim with dolphins, explore caves and cenotes, see Mayan ruins, and view wildlife and plants native to this area. Truly this is something unique to Cancun.