We had a fantastic time on our hike down one of the Grand Canyon's tributary canyons. We started from the Hualapai Hilltop and hiked the eight miles to the Havasupai village and then another two miles to the campgrounds near the Havasupai falls. We spent two days down in the canyon, and then hiked all the way back out under the hot Arizona sun.
Jason also put together a couple of topo maps for our hike. The red line indicates our trip from Hualapi Hilltop down to the campgrounds at Havasupai Falls and the yellow line indicates the path from Havasupai Falls to the Havasupai Rapids on the Colorado River. However, I don't think that anyone went all the way to the river.