Hiked Cahuilla Mtn earlier, then drove over to Thomas Mountain. Drove to Tool Box Campground, and parked at road "B", then walked from there to the top. Got some exercise, met a lot of campers and their dogs. Nice views of San Jacinto.
I think this is the only drive-up summit I have ever done, and only summit I have ever camped on. Great place to run the dogs and get a little relief from the heat. It gets surprisingly little use. The northern end of the Thomas Mtn road connects to an interesting but generally not too difficult web of truck trails (high-clearance 4wd recommended).
Hiked up to Cahuilla and Little Cahuilla in the morning, then over to Lookout Mountain. Next, drove up to Thomas Mtn. and Rouse Hill, then finished on Indian Mountain. Lots of driving on this day, but great scenery and some good hiking too.