Metra - Chicago's public transportation system.
For those of you who are staying at the hotel but want to visit the city and either don't have the availability of a car or would rather not drive downtown and park, you can take Chicago's Metra system. You can catch the train a short ways from the hotel and ride it to the downtown area. Here's a link to their website. http://metrarail.com/metra/en/home.html