What kind of riding are you looking for? There's treat mountain where there's a few trails but mostly dirt roads where everyone hangs out on the weekends. There's also a few good mud holes to mess around in.
It's free but now a lot of people hunt at treat so you really can't ride there til the seasons over and I'm not really sure about tally mountain. I've just had people tell me about it. You might be able to look it up.