We stopped here on the way out to Sedona, and I'm glad we did. The view was spectacular. The hike up to the hole in the rock was easy, and the path had stairs carved into it as well. Once on top you had a nice view of camping areas, the zoo and a distant view of down town Phoenix. We went in the morning, so the sun cast a cool relaxing shadow over the viewing area on top. I am glad we went and would go again.
Also, the entrance to Hole in the Rock is off of the same road as the Zoo entrance. If you are taking a trip to the Zoo, this can be a quick side trip that is certainly worth it.