I have a free night that needs to be used by Feb 29 (this night wasn't from the FFN, it was from a "we miss you, if you stay with us by November xx we'll give you a free night").

I'm looking for a place in reasonable driving distance of IND where I can spend a weekend, stay in a nice hotel (that I might not otherwise stay in), and do something fun with the wife and two pre-school kids. I have considered that the Park Hyatt Chicago is probably the best hotel in driving distance, but I am concerned about the possiblity of snow and/or bitter cold (with kids) in Jan/Feb so I might want to consider other ideas.

Any recommendations? (Louisville, Cincinnati, St. Louis, Chicago (in spite of weather), other??)