Lake Michigan Chicago, IL marinas?
Here''s a link to the Chicago harbors - http://www.chicagoharbors.info/
If you can trailer your boat in they have some ramps. About 3/4 of the way down the page on the right hand side it shows the ramp charge at $20.00, and daily dockage rates to the left of that. If you belong to a yacht club, the Chicago Yacht club has some kind of a mutual deal for daily docking. I don''t know where the daily docks are, but if it''s Burnham harbor it''s a very quick walk to the loop, the art institute, and pretty close to the museum of science and industry, Shed Aquarium, and the best restraunts in the world! The above link has links on it''s left to harbor maps and etc.