On the same trip as the trip to Garnet Peak, I made a quick side trip up to Garnet Mountain, while the rest of the family waited at the Kwaaymii Point trail head, which turns out is a hang glider launching point.
It was a short jog up what looks like a jeep trail.
After a couple of hundred feet of minor off-trail hiking (not really bushwhacking, since the bushes are low-growing). I was on the peak. I signed the summit register, allowed the breeze to cool me off and drank in the views to the east into Anza-Borrego Desert State Park.
In a couple of minutes I was back down.