Ever thought about tracking wild carnivores through the woods of Madagascar, or studying great white sharks off the coast of South Africa? Well, start racking up your vacation days. These 10 adventure trips offer a great mix of downtime and blood-pumping action—one day you'll be planting coral reef off the coast of Borneo, and the next you’ll be diving with whale sharks. The best part? It’s all for a good cause.
See also: 10 Best Hikes in America
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