Zip Line is a canopy tour, meaning that with a harness you will glide from one tree terrasse to another. As of Cozumel, the tour actually takes place on the mainland since this activity requires big and tall trees. The site is located near Puerto Morelos, a ca. 40 min drive from Playa del Carmen where the ferry arrives. There are about 18 platforms in the trees and everything is fully guided, some phisical fitness is required to manage the different steps at each platform....lots of FUN! Part of this tour is also some bicicling through the jungle and a swim at a cenote (fresh water hole in the jungle..spectacular and refreshing). Some snack is served after the tour..you certainly worked out an appetite by then. Good experience and really safe.