After meeting your tour guide at the hotel, travel for approximately an hour towards Sabang. When you arrive, go to the designation station and wait for the boat that is assigned to you. After a quick boat ride to the Underground River National Park gate, hop aboard a searchlight-equipped park boat and head down the Underground River. On the 1.5-kilometer journey, take in the stunning crystalline and stalagmite formations. Return afterwards to the pier and eat lunch at a nearby eatery. Return to Puerto Princesa by van. Experience a thrilling zipline ride, if there still time.