This is a great trail, but it's awfully crowded. We had beautiful fall colors the entire way. We hiked up Marshall Gulch, then turned left at Aspen Trail. There is a nice overlook a half mile along. We had an amazing rainbow while there. I'm not sure that happens every time though. :) Due to time restraints, we came back down Marshall Gulch.
Really enjoyed this hike. After driving through Summerhaven go to end of road. We got on the trail right behind the restrooms on the right side and took the loop counterclockwise. The first half of hike felt like I was in New England. Cool temperatures for September. The second half is SO beautiful as you go through hundreds of new pine trees and then the aspens. It was a little busy for the first 10 minutes, but then we were alone most of the hike. Easy-moderate. So much different than Sabino and Catalina but still lovely.