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Piru is fun. not that it's all that tough, it's that it has quite a bit of different things to psych you out. from exposure to a few cliffs, the ramp that is placed over some rocks give it that extra touch, whereas, you don't even have to use the ramp. there is a couple of creek crossings, some sand and rock. not that i'm by any means fast on it now, but the first time through it, I crawled. just need to be sure of your techniques in sand, rock, water crossings, and not to get froggie around some of the cliffs.