Me and some friends went to Shiloh Ridge last weekend. It is a privately owned motor vehicle park located in the very small town of Alto, Texas. Here is their website:
http://www.shilohridge.com/
It is a pretty cool place if you are ever in the neighborhood. We had an unusual group of vehicles in our group: my Xterra, 2 Jeeps, a dune buggy, and a 2001 Honda CR 250. The motorcycle was definately an adrenalin rush. Here is a pic of me and my co-pilot, Sundance: