What's a good campground near Chicago?

Travel Info
Looking for a place to put up a tent for a couple days. I live in Chicago, so somewhere nearby would be good. I really just want a pretty forest to walk around in, so the "resort" type campgrounds aren't really what I'm looking for.

Travel Tips

Try a park bench!
Others

Chicago Northwest KOA Campground Open April 20 - October 9 The closest KOA campground to Chicago yet we are situated in a friendly rural setting of rolling hills, shade trees and the sounds of quiet country. With cabins, tent sites, level pull thrus, 50 amps and full hook-ups, we can accomodate virtually any camping requirement.

Free Wi-Fi is available for your wireless enabled PC. We are a 24 hour gated campground where everyone is escorted to their site.

You can take the "Metra" train from two nearby locations to see Chicago, it's festivals or to take in a "Cubs" game. Closer to the campground is the well known Woodfield Mall and for adult fun, the Grand Victoria Riverboat Casino.

With planned activities Memorial thru Labor Day, Wild West Town next door, and the Illinois Railroad Museum in Union (home to Thomas the Tank Engine in late August) fun can be had by all.
How far from Chicago? There is the Indiana Dunes State park where you can go, relax, there is a beach, dunes, you can hike, and camp. Enjoy where ever you wind up.
Illinois Beach State Park for closest camping. Not a forest but plenty of trees and hiking. You can even stay in a resort/hotel. Check the site below:

http://dnr.state.il.us/lands/landmgt/par...
lake le aqua na (sp) is a state campground. it's very pretty and calm. it's near galena. type in il state campgrounds.