This is a nice little hike in North Phoenix. Scarlett Canyon I believe is part of the Union Hills Mountains. It is an easy hike to follow as the mountain itself is rather small. It is about a 3-mile loop. There are no trail makers at all.
The entrance to the trailhead is on the east side of the mountain. The east side of the mountain was the most enjoyable for me. In the afternoon you will be in the shade with lots of big bushes as well as large boulders.
I always start heading north and go around the mountain. On the north side, you will run into an old mine that is fenced off. I believe this to be the Union Mine.
Once you reach the west side you will see houses along the trail. You will also see where the mountain was graded for gravel I think. This also means less plant life, but you can see another trail leading up to the top of the mountain. And on a clear day, the views are breathtaking.
Check out the Official Route and Triplogs.