Kanab's Peek-a-Book Canyon is an awesome slot canyon that's a moderate hike and not as crowded as other in major parks. En route to the canyon, you'll enjoy an exciting off-roading adventure while getting to the canyon.
The trailhead is Red Canyon (aka Peek-a-boo) trailhead located just off of Highway 89 between Kanab and Mt. Carmel Junction. The GPX track shows the entirety of the trail, but if you have 4WD and a high-clearance vehicle, you're able to reach the closer parking area for a less than 1-mile roundtrip hike.
This map might be useful too - http://goo.gl/RYK3DP
Key Point: