Ecological park and nature reserve is a breathtaking environment of mangrove jungles, white sand beaches and reef formations at the south end of the island. The park extends over more than 247 acres of land harboring a varied wildlife, including crocodiles, which visitors can watch from a safe distance in a look-out tower, 220 species of birds, iguanas, and giant turtles, which come to shore between June and August to lay their eggs. Among the park's most interesting structures is an old lighthouse and navigation museum displaying the evolution of seamanship and navigation from the time of the Maya to modern times. Here, visitors can also learn about life in Cozumel during the first part of the 20th century through photos and other articles belonging to several generations of lighthouse keepers and their families. Near the lighthouse, El Caracol is a well-preserved ancient structure, used by the Mayas to signal the approach of a hurricane.