It here's not much in north eastern il, south eastern wi. The circle lake tour is OK, but I wouldn't put it on any list except for the part that goes through michigan.
The western part of the state has some nice areas, but nothing to compare to the Rockies or Appalachians or Ozarks. The Galena area is nice except for all the Harleys.
Stay off the freeways!
Use a map program to find the secondaries that go thru all the small towns.
I've never ridden in that area, but:
http://www.motorcycleroads.com/search.php?q=wisconsin
http://www.motorcycleroads.com/search.php?q=Illinois
I haven't used all these personally.
http://www.motorcycleroads.us/
http://www.sundaymorningrides.com/
http://www.motowhere.com/listpaths/country/254
http://www.gpsxchange.com/