Being from Chicago, I would recommend getting a rental car. I think a taxi would cost a lot of money, perhaps just as much or close to renting, so giving yourself the freedom of having a vehicle will be worth it. Yeah, traffic sucks, but it isn't that difficult. Everything is clearly marked, so as long as you have your mapquest printouts, you'll be fine. Also, the Downers Grove and Oak Brook (2 minutes from DG) have awesome restaurants. I highly recommend going to one of them for something good to eat. If you need any suggestions, PM me and I"ll give them to you. Definitely go for the rental car though.