I think it is a good idea if your hotel is in downtown.



Parking is expensive in Chicago. There should be some free trolley services.

http://egov.cityofchicago.org/city/webportal/portalContentItemAction.do?BV_SessionID=@@@@0718515617.1116974452@@@@&BV_EngineID=cccfaddejlkjmgfcefecelldffhdfhg.0&contentOID=536926776&contenTypeName=COC_EDITORIAL&topChannelName=HomePage

I don't live downtown and some MM from Chicago downtown might be able to give you more info.