Río Camuy Cave Park

The Río Camuy Cave Park, on Puerto Rico's northwest karst belt, protects part of one of the largest cave systems in the Western Hemisphere, carved over millennia by the Río Camuy, among the largest underground rivers in the world. The limestone here is riddled with sinkholes, passages, and cathedral-sized chambers.

Guided visits typically descend into Cueva Clara, a vast cavern hung with stalactites and stalagmites, with views of sinkholes where the river disappears underground. It's a cool, damp, family-friendly outing; hours and tour availability vary, so confirm the park is open before making the drive into the interior.