Our hotel in Chicago was on the northern edge of Millenium Park. We were also about 1/4 mile from the Lake Michigan shoreline.
In the park - they rented bikes for $10 an hour. the weather was prefect - approaching 80 - but maybe a bit too windy. We got bikes and rode up the coast. The wind was causing some small waves - there were some people sun bathing - but no one in the frigid water.
In the top picture you can see our hotel. It is the tall brown building with the green pointed roof. The second picture is Lulu on her rental bike.