You can go to SMORR in Seymour, MO
http://smorr.net/They have an actual obstacle course, mud pit, and RTI ramp you could play on, plus a 1000 acres of trails Also, if you get stuck or have problems, there is someone there to help. You'll have to check them out, and check out the rates page to see what it costs. There is also heated bath and shower houses, a deli, and electric campsites.
Chadwick is free, but if you go to Chadwick, go with someone... otherwise no one will be there to help you should you get stuck or have problems.. and it's a long, long walk to get help.
You'd have fun on the Halloween run and if you never been out, would be a great run to pop your cherry on.
Welcome to the site and jeep ownership... you'll never be the same.