We loved hiking in Bryce Canyon National Park on the Peekaboo Loop Trail. The trail is listed as a strenuous hike due to changes in elevation from the trailhead to the canyon floor. The loop is 5.5 miles long and moderately trafficked.
The hike leads to a landscape that looks like out of a fairy tale where hikers can admire multiple rock windows, hoodoo spires and incredibly beautiful rock formations ranging from pink and apricot to white and brown shades. Check out the National Park page for more info: https://www.nps.gov/brca/index.htm