The main trails in the county park are OK doubletrack to ride, but the good trails run out into state land. Stay to the right and kind of follow along the highway until you get to a singletrack on the right. Take it and you'll have to go under an over-pass. Now you're to the good stuff.Usually muddy out here, even when its dry. Many technical sections (tight and twisty) with some short but STEEP climbs. Very fun. It is a pretty challenging ride, not a place for first-timers. I wouldn't go out for a couples days after a good rain, unless you really enjoy cleaning...
Exit US-10 at West River Rd. (just west of Sanford Lake). Head west on Maynard Rd. (along south side of highway). There will be a wooden county sign there. Take the road to the end.
http://www.singletracks.com/item.php?c=1&i=266