No, it is not for real. Jim Turner, the "explorer", identifies the island as Robinson Crusoe Island, Chile. It is a well known tourist destination as the inspiration for the novel "Robinson Crusoe". It has a town, San Juan Bautista, with 550 people, and another 100 live scattered over the island. There is an airport and a harbor with regular ferry service from Valparaiso, Chile, 400 miles away. The rocks are just natural basalt outcroppings according to an archeologist who worked on the island and visited the site. The Island is 3500 miles from the nearest Mayan area in Guatemala, an impossible distance for Mayan canoes. Compare with 4000 miles for the voyage of Columbus. Even Jeff Salz, Turner's companion on the excursion, says there was no sign of human work on the rocks or of ancient human presence in the area.
http://photos.apocalypseisland.com/GalleryFilmstrip.aspx?gallery=296763&mid=9902975&mt=Photo (click on it to enlarge)
http://jeffsalz.wordpress.com/2009/11/14/156/#comments (go January 14 response)