Once or twice a year, there is a XC race out by Gatorback MX park. It's private land, so it's only accessible during race weekend. Worth the wait. I used to drive up there the Sat. of the race weekend just to ride the course.
Other than that, Santos as mentioned is a great place to ride. Worth the 45 min drive south. Also, Razorback in Reddick (yeah I know).
For maps check out
www.omba.org
Also, you MUST eat at Burrito Bros. for me!!!!
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger