Also, Chicago is built on a simple grid-map of north and south streets but many of the streets in the downtown are one way and traffic is always heavy. Less expensive underground parking is available near the Hilton Chicago at Grant Park. We suggest you use public trains and busses or cabs, which are not expensive. Local attractions are easily reached by bus or train or a combination of both. The core of the elevated train system is a rectangular set of tracks that circle the heart of downtown Chicago.
Trains are safe, convenient, and cheap.
You will need exact change or you can use the Transit Card or Visitor Passes. Transit cards, which can be used on both trains and busses, are readily available from vending machines at the train stations. It is a very helpful guide.