Sharks -- South Water Caye, Belize
Shark cages are for wimps – you, instead, can join Earthwatch to spend your holiday snorkeling around one of the world’s most beautiful reefs, while chilling out with sharks... sans bars.
Volunteers work alongside scientists on research boats for 10 days, counting, catching, tagging, and filming sharks, as well as analyzing and cataloguing fins. And did we mention it's in paradise? Eat your heart out, Jaws.