Rockstacker is a truly incredible section of running right on the rim, high up above the Colorado River. The trail is easy to follow (via cairns and painted blazes) and can be completed in any direction. If descending from the Pothole Arch Trail, however, there are a few steep spots of downhill scrambling at the beginning. After this section, enjoy twisting and turning over slickrock, and like all the trails in the area, be very aware of mountain bikers!