Key Lime Cove is the only water park/resort in the area. It is indoor and open all year. There are kid s activities at Navy Pier and more at Millenium Park including ice skating in the Winter:http://www.navypier.com/http://www.millenniumpark.org/parkevents��The Hyatt Regency on east Wacker is kid friendly. It s located close to the free trolley to Navy Pier that runs on Illinois and Grand Ave and about 4 blocks from Millenium Park:http://chicagoregency.hyatt.com/hyatt/ho��
I definitely recommend Hotel 71, which is right at Wacker Drive and Michigan Avenue. It has a fitness center and offers shuttle service. The rooms are also generously sized, perfect for families.
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