As others have suggested, check the hours of those places you will visit. Both the Newberry and the Chicago History Museum are closed on Mondays. The latter is closed all weekend, and only open in the afternoons due to budget problems. Four days sounds like a lot, but not over a weekend. Try to set up a detailed schedule for each day. Get a good map - I found a good folding one called Chicagoland from Rand McNally. Have fun, Bart