The Cox Canyon Arch (a.k.a. Anasazi Arch) is the best of many small- to medium-sized arches in the Aztec and Farmington area. The trail is short, maybe a half mile, but does require significant, short scrambling. With a helping hand most able-bodied hikers and pets can access the arch.
There is a small, formerly inhabited cave to the southeast of the arch. I navigated a route along the rimrock to access the cave. There is a bit of scrambling and bushwhacking on this route. Just beyond the cave you can climb down to the sagebrush-covered valley floor.
The short access road from the main Cox Canyon Road can be muddy. After a rain, park on the main road and walk to the trailhead.