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On the Big Island Waterfall Rappelling tour, explore the beautiful scenery and natural beauty of Hawaii. Swim, float, rappel and hike through the valley, and enjoy the unique features of the Umauma River. You will start your adventure by rappelling 250 feet into the Umauma valley. The last 20 feet is a cave, and you will free rappel right into the river. Once you’re in the river, relax as you you float down to a 100 year old flume dam, which was made in 1910 and is still perfectly in-tact today. It’s like an infinity pool! Then you will boulder down a short distance to a natural stone slide formation, and slide right into a large pool. On this tour, you will also rappel down two waterfalls.