Body rafting takes going with the flow to a whole new level. No boat and no paddle, just you floating downstream between canyon walls in a life jacket, reading the current as it carries you. Your day starts well before that, on a private nature reserve in the karst mountains of northwestern Puerto Rico that most visitors never reach. Climb and squeeze your way through the cave systems first, then hike out through tropical forest that has been left largely alone. Certified nature interpreters lead every stretch and handle the gear, so you reach the river already knowing what to do. No experience or swimming skills required, just a sense of adventure. Underground, overland, and downstream in a single day, on land the guidebooks have not reached.