Right on to Dry Creek Road and follow 2.8 miles to Boynton PASS Road. Turn right and continue about another 4 miles to the trailhead described above just before the entrance to the Hancock Ranch. This is a great trail. I've traveled the lower sections in the years past and look forward to returning someday. The whole trail is scenic not to mention the drive in.
Backpackers can connect to Secret Canyon and many other options there after.
I'll echo both Mike and Joe's comments. This is a great trail. The soft sand on the trail on the lower elevations is my least favorite part, but the ruins can be viewed to the south along the wall of Loy Butte. Once on top of Secret Mountain, the views are non-stop and there are some fantastic campsites right on the rim. But breakfast on a ledge overlooking the Red Rocks is better'n any Starbucks.