Part of a worldwide bus-tour company, Gray Line Chicago offers professional tours in well-appointed buses. Excursions run 2 to 5 hours and feature highlights of downtown or various neighborhoods. For an additional fee, some tours include a cruise on Lake Michigan or a visit to the Sears Tower Skydeck.

Copyright: Excerpted from Frommer's Chicago 2009, (c) 2008, Wiley Publishing, Inc.

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