I've been out to The Cliffs, an offroad park, west of Joliet. It's about an hour drive from Frankfort. Has lots of wooded trails, some kind of narrow, a little mud, and a stream to play in. Our typical routine is to hit the trails for a few hours, then head off to the local biker bar for a round or two.
'08 JK Wrangler X - Jeep Green, Dual Tops, 5.7L Hemi, 6-spd, 3" Black Diamond lift, 35x12.50 BFG Mud Terrain KM2's, ProComp 1079's.
'08 WK Grand Cherokee Overland CRD - Steel Blue
'05 KJ Liberty - Black