We hiked a long trail in the northern portion of Zion NP. The hike was 14 miles with 1000 ft elevation gain. The main portion was the La Verkin Creek Trail, with a small add on to see Kolob Arch. Hiking conditions were good: cool temperatures and a walking surface of packed soil most of the way. The length did tire us out, though. With stops, we finished in just under 8 hours. (The distance measured by my pedometer, which is counting steps, was a bit over 17 miles.)
Bilbo on the Move 