impossible,
To be honest with you, I can't think of a better thing to be doing this weekend then just walking around downtown and enjoying the sights. The weather is supposed to be close to picture perfect this weekend, and its hard to beat a gorgeous summer day in Chicago. I'd recommend starting near the center of the city (State and Madison) and just go wherever your instinct leads you. You should definitely head north and see Michigan Ave., but don't limit your trek to the Mile, as there's lots of cool sights and architecture to see in the general area. The River North/Gold Coast area is very nice for walking and there are lots of good restaurants along the way. When you're in the Festival area, be sure to take some time to see Millennium Park. The Art Institute is nearby and, if you have time, is definitely worth a visit.