March 16, 2007—Tarzan, eat your heart out. Zip lines and walkways crisscrossing Costa Rican jungles are offering monkey's-eye views of these vibrant habitats.

Up until the early 1990s the rain forest canopy was largely limited to photographers, biologists, and animals. But now tourism is taking to the treetops, for better or worse.

Watch as intrepid travelers glide through the jungle—and as biologists, conservationists, and businesspeople collaborate to make sure the rain forest views don't come at the expense of the forest itself.