Use sunset as your turnaround alarm.
The sand is the whole story here. Six-plus miles of soft canyon-bottom sand takes more out of your legs than the 521 feet of gain suggests, and it is why this reads harder than a flat trail on paper. BLM keeps an interpretive brochure at the trailhead and it is worth grabbing, because there is rock writing in this canyon that is easy to walk straight past. Restrooms are at the trailhead, and you are expected to pack out solid waste in a WAG bag.
126 ft falls with a swimming hole at the end of a sandy canyon. Worth every step.
Heat note: desert country - in summer start at dawn and carry more water than feels reasonable.
2 liters water, trail shoes, sun layer, snacks, small first-aid kit.
Make it a weekend: Calf Creek Campground (Camping, 0 mi) · Wide Hollow Reservoir (Fishing, 12 mi) · Boulder Mountain Lakes (Fishing, 20 mi) · Singletree Campground (Camping, 21 mi)
More hikes nearby: Zebra Slot Canyon (Hike, 12 mi) · Peek-a-Boo & Spooky Gulch (Hike, 24 mi) · Coyote Gulch (Hike, 30 mi) · Capitol Gorge & The Tanks (Hike, 32 mi)