Aside from exploring Puerto Princesa’s famed Underground River, add more thrill to your adventure by squeezing in a trip to the Ugong Rock Adventure–an ecotourist attraction located just a few kilometers away from the river. Perfect for adrenaline seekers and nature lovers alike, the Ugong Rock Adventure and Hundred Caves 1-Day Tour includes exciting activities like caving, spelunking, trekking, and ziplining. In the Hundred Caves, get to see astounding stalactite and stalagmite formations in interesting shapes that took thousands of years to develop! Get to experience all these and more in this wonder-packed full day tour.