Trail north of Casino Morongo going into whitewater, if you can get across the reservation.
My car-free suggestion is use the PCT path under I-10 via roadwalk or rideshare from the casino (which of course has a shuttle bus from Banning/Beaumont <-> San Bernardino), leading around the cabazon neighborhood, and go in through the PCT access in the middle of the windfarm.  Not the most scenic but it’s only about a half mile or so already in a small valley.  The rest is pretty scenic to very scenic.  Gain the ridge (cell phone signal btw), then descend towards WW, maybe stock up with treated water at the preserve, backtrack a bit, then take the PCT into the creek drainage.  Could either follow the PCT towards Big Bear or do some surrounding trips.
I’ve only hiked the PCT track through there, but prefer the wide open trail having almost stepped on a baby rattler (in the forested upper section of all places .. those suede LP light hikers felt mighty thin at that encounter, though baby snake slithered off-trail when it realized it was spotted).
There’s driving to WW but frankly catering to that crowd that causes the preserve to wuss out (oh there’s a 5 MPH wind .. we need to close the park so someone’s hairdo doesn’t get messed up)

