I have a reservation at IL Beach State Park Fri & Sat. Riding up from Chicago to use it on Friday and won't be using it on Saturday if anyone wants to ride up and use it!
I know I've biked up planning to camp before and wasn't able to get a spot, so claim it if you want it.
My cell is 269-830-0798 to get the info.
On a side note,- I have called the Illinois State Park system recommending they don't require bicyclists and backpackers to reserve a campground. Michigan and Wisconsin do not turn away human powered travelers to camp, they always have a place to set up a tent.