Not that I buy into the idea that this silly chunk of rock is worth visiting and not that I'm trying to egg you on...
But I do notice on Google, that the "street view" extends all the way to the entrance to Twin Pines Ranch. Here's
an overview map of the area.
Notice how Twin Pines Ranch is just west of Hurley Flat. Now,
here's where the Google truck could drive to (i.e. publicly accessible), basically to the gates of Twin Pines Ranch. Here's a photo (screen capture):
Notice that there is some kind of gate and some kind of sign (that presumably says that the road is not open to the public or something like that). Note also that there are vehicles pulled over to the side. If people are parking there, perhaps it's OK to walk in? Dunno.
It's about 1.5 miles from the gate/entrance to the base of what I'll call "Cabazon Ridge" (since it contains Cabazon Peak) -- the ridge that also hosts Onion Rock.
HJ