Here is a video from our trip to OK city.
The link below is from a new camera i am using. Its call a ContourGPS. I have only used it once. Still have to work on it a little bit.
http://contour.com/stories/crosstimbers-1
Here is another one
And one more
Over all review of Crosstimbers in OK city, pretty fun. The trails are for beginers. Some tight stuff, but nothing my wife couldn't do on her bike.