Originally Posted by Mut
If you do a 2 night trip Rattlesnake Canyon is a couple miles down on the river left. It is a sweet small camp right on the river and an epic canyon to hike up. If you hike a few miles up you will see as many or more arches than in Arches.
I did this hike earlier in the summer and be aware the trail has washed out in several places. It's still possible, but difficult. Felt like a couple thousand feet in a couple miles... the arches are awesome though.