Walnut Canyon National Monument
Tips: I'd recommend visiting the canyon if you have kids that don't mind climbing a lot of stairs. The path in is easy as you're climbing down several flights of stairs but once you complete the loop, you'll need to climb back up and that could be tough for smaller kids. My kids were 9 and 12 when we visited and they handled it fine. My daughter even challenged me to a race back up. We were pretty tired once we reached the top, and yes, she won.