We started our hike at 10AM. There was a guy at the trailhead warning people about how hard the hike was and that it would take at least 7 hours round trip. It took us an hour to get to the beach which was okay but not really worth the hike if you don't continue to the falls. This was the more challenging portion of the hike with lots of muddy areas, slippery rocks, and steep grades. The hike from the beach to the falls was much easier. There are several stream crossings but we managed to navigate them all without getting our feet wet. The hike from the beach to the falls took an hour. The falls are spectacular. The water is cold but not too cold to swim in for a hardy Canadian. We spent about an hour at the falls and swam and had lunch. The entire round trip took about 5 hours including lunch at the falls and a 5 minute break at the beach both directions. The shower at Ke'e beach was helpful to wash off the mud. Overall it is worth the time and effort but it could be much more treachorous in heavy rains.
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