I am going to Chicago for the first time in early June and will be there for 3 nights (Mon, Tues, Wed). We will not have a car and are staying in the River North area. I'm looking for recommendations for great places in the area. We will probably try Frontera Grill on one night. I'm not looking for super expensive, chi-chi places, but it doesn't have to be cheap either since I will have a expense line for this trip. I know lots of places are closed on Monday's so any special recommendations for that would be great. We probably won't be doing pizza or Italian beef or any of those wonderful Chicago specialties this trip.