Murray Springs is a state park, in the Sex Listings portion of CFS. It's a series of trails on the northeast side of Sierra Vista, where fossils have been found in the past.
Supposedly, there's sex going on there (ca. April 2009,) but I saw no evidence of that when I was out there earlier this week. It's a good spot though because there's not much foot traffic out there and the trails are well worn and secluded.