I can vouch for The Cliffs - truely an "insane terrain" park. I came away with a bit of damage, mostly easily repaired.
Wisconsin (at least southeastern) is not much better than IL in regards to available terrain. Both states need to move ahead with OHV sticker programs to allow the use of ATV trails of which there are many.
If you feel like heading towards Eau Claire WI you can explore a bit on the Jackson County Forest "roads". About 2 hours northwest from Madison off of I94.
07 Limited, Hemi, factory skid plates (dented and scratched
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), 4XGuard rock rails, OME HD springs and shocks, Spidertrax, Goodyear Dura Trac 245/70-17