I'm not sure what "driving distance" you're looking for, but Wisconsin Dells/Delton will blow the hotels in this area out of the water. (No pun intended.) They are about a 4 hour drive north, depending on where you're coming from.
I grew up in that area, so i'm not to familiar with the hotels near Chicago. You can get MUCH better rates 'off-peak', so you're timing is good. I can give you more detailed info, if you're interested.
Re: Best indoor water park/hotel?
I'm not sure what "driving distance" you're looking for, but Wisconsin Dells/Delton will blow the hotels in this area out of the water. (No pun intended.) They are about a 4 hour drive north, depending on where you're coming from.
I grew up in that area, so i'm not to familiar with the hotels near Chicago. You can get MUCH better rates 'off-peak', so you're timing is good. I can give you more detailed info, if you're interested.