If I could be transported to one hike, right now, it would be Paria Canyon. (5 days, 4 nights, 37.5mi (60.4km) plus sidetrips)
These are the longest, best slot canyons in the world. Many hikers have drowned between steep cliff walls in surprise flash floods. Careful planning is necessary to get your hands on a much-coveted hiking permit.
The ultimate challenging route includes Wire Pass Trailhead, Buckskin Gulch and through Paria to Lee’s Ferry, Arizona. The Wave is a must sidetrip.