Probably not many in this discussion group frequent the Art Smith Trail on Hwy 74 south of Palm Desert right before the mountains begin and right across the street from the National Monument Visitor Center. I live in Palm Desert, and use the Art Smith Trail, the trail to the Cross from Cahuilla Park, and in moments of morning insanity even the Bump and Grind trail for dawn or pre-dawn trail runs or hikes. I've noticed recently that the official Art Smith Trail parking lot directly across the street from the driveway that leads into the National Monument Visitor's Center is showing some signs of vandalism. At least three of the marked parking spots in the Art Smith lot have piles of broken auto safety glass in them. I have no positive evidence that these are due to car break-ins, but I'm very suspicious of that, since the lot is in a shallow basin, and can't be seen from Hwy 74 not 30 feet away.
My recommendation, if you plan to hike the Art Smith Trail, is to park on the west side of Hwy 74 directly across from the roof line of the Visitor Center. You have to walk the quarter of a mile from the parking lot to this area anyway to get onto the trail, and your car is highly visible in this spot. This parking area is just a few feet north of the official Santa Rosa and San Jacinto Mountains National Monument sign, and nearly directly below a huge boulder on the top of the levee which in actuality is a Sprint cell tower disguised as a boulder. Be careful out there!!
