Flow and Fall time goodness, what is not to like. The McGill trail located on Mt Pinos near Frazier Park well north of LA is pretty cool. Very nice if you and your buddies can shuttle it, but it is doable with a mild 8-mile road climb. You should put this trail on your list if you are going to be in the area.
I also did the the out and back route to the summit of Mt Pinos as well. If you made it that far up the mountain you might as well go all the way. Here is my route on this particular day where I started from the McGill Campground halfway up the mountain .