Pumpkin Rock is located in Horsetown USA, also known as Norco, CA, Just North of Corona off the 15 freeway  It’s a great day Trip!  Take the kids on a hike, it is STEEP, so wear hiking boots.  Also alot of “art” on the rocks so may be some wording not appropriate for little ones.

I parked at Pumpkin Rock South- Google maps  off of Vandemolen and Valley Drive, near the golf course.