The only closest rideable trails I found are in Indiana but I was hoping to find something closer to the city for a spurt of the moment thing.
I was there in August last year and it was pretty muddy. One of the guys I was with (driving a Wrangler) said it was the driest he'd ever seen it! I do agree, if you stick to the outer ring, it's pretty open....and you can make it through the Cliffs without damage but IMO you need to stay on the outer trail and go when it's dry. That place seems to get real muddy real fast.