Capitol Reef is probably my favorite national park in Utah because it's not nearly as crowded with people as the other parks. Canyonlands is my favorite for scenery, but nothing beats Capitol Reef for peace and quiet. We only saw two day hikers on the entire route - it felt like we had the whole canyon to ourselves.
We hiked Lower Muley Twist Canyon in the extreme southern portion of the park. The trail was basically a dried riverbed at the bottom of a canyon. It was absolutely beautiful and probably a horrible place to be in a flash flood. We found a nice little spot to camp about 8 miles into the canyon and hiked out the next day. Some pics...