Thanks to countless access points, this one of the most versatile hikes on the south rim. Out and back runs are an excellent option if you're staying at the campground, but most runners would opt for a shuttle, utilizing one of the free shuttle busses to return to their vehicle or campsite. If you were to run the full length of the trail, the run would be near 13 miles. Though debatable, this may be the most scenic half-marathon in the entire country!

The eastern trailhead doubles as the start of the South Kaibab Trailhead, one of two popular routes to reach the Colorado River. The other, Bright Angel Trail is located at the Grand Canyon Village also along the South Rim Trail. With the campground and adjacent Visitor Center nearby, this is one of the busiest areas in the entire park. It is also the only place to refill on water until the trail's end.

As you head further west, the Rim Trail parallels Hermit Road, often incredibly close to the edge of the rim. Other than the overlooks, many sections are unpaved and shaded by trees, though it never ventures far from the road.

Finishing out the final leg, the trail showcases several excellent vistas including Hopi Point, Mojave Point, Monument Creek Vista, Pima Point, before its final terminus at Hermit's Rest.

Sources: https://www.10adventures.com/hikes/grand-canyon-national-park/south-rim-trail/