Took a day trip to Talsma's Trail Park in the Avon - Springfield area. The "park" caters to 4-wheelers and UTVs, no single track, but it was fun. I would say they have about 30 miles of trail, plenty of mud (not a fan of mud :P ), rolling hills, revines, creek crossings & a few hills to climb. A couple of the trails are closed because of the Missouri river flooding. They have a camping area and porta-pottys. $25 dollars a day to play though :-\
Didnt get a lot of pictures but made a short vid outa it.
http://www.youtube.com/watch?v=ko5gkA-KTks (http://www.youtube.com/watch?v=ko5gkA-KTks)
http://www.talsmastrailpark.com/ (http://www.talsmastrailpark.com/)
cool, thanks for sharing. i never knew there was a riding area down there. not too far from a bunch of us east river folks.