What lies beneath the islands of the Caribbean? Come see at Puerto Rico's Rmo Camuy Cave Park, termed the world's third-largest underground river cave system. The usual gamut of subterranean sightseeing tours are offered, but you can also get doses of serious caving here: Rappel 200 feet through the cavern entrance; crawl through passages of mud; body raft along the underground river; or see rarely visited parts of the cave. And while at first it may seem like you're discovering this underground world, you'll soon see evidence that you've been scooped by about 500 years—cave paintings and carvings by the island's original Taino Indians are proof. Parts of the cave can close during heavy rain; rainy months are July through November.
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