Great Blue Hole, Belize
Why: Since Jacques Cousteau first explored the sinkhole in 1970, calling it one of the world's top ten scuba diving sites, the Great Blue Hole has remained in pristine condition. But luxury resort projects and oil interests are putting the UNESCO World Heritage Site at risk. "Belize has offered up 99 percent of its waters to offshore drilling, including the Great Blue Hole, even in light of widespread citizen opposition," says Oceana's Dustin Cranor. "Can you imagine a Deepwater Horizon-like spill in the Blue Hole?"
What to do: The solar-powered Turneffe Island Resort is perched on a 14-acre private island, 35 miles off the coast of Belize. Travelers come here to eat, sleep, and dive, so you can count on memorable trips not only to the Great Blue Hole, but also to some of the 70 dive sites within a mile of the hotel.
More info: belize.oceana.org