Woodsy Venues Near Chicago?!

I am having a heck of a time finding a forest ceremony site in my area. The closest I've found is Burlap and Bells in Wisconsin, which I love..but that's nearly 4 hours from where I live and I know a majority of my family, outside of my parents and siblings, would not make that drive. I am trying to keep the venue 2-2.5 hours from the Chicago area (totally willing to go into Wisconsin!). Anyone have any insight on woodsy venues in that area? Alternatively, if you've done a state park ceremony with over 100 people I'd love to hear how you pulled it off! Thanks in advance for any help.