“Eventually” was yesterday. Google Maps guided me from I-10 and through several of the Palm Springs golfing communities to Highway 74—a.k.a. the Pines to Palms Highway (though I was going palms to pines).
The Forest Service has a small campground at Pinyon Pines, near the highway’s summit. Only $8/night. Half that with my interagency old fart card. I put $5 in the envelope because I didn’t have change.