Looking for a place to take 12-20 people with kids 6-20 years old. Need a place by amusement park, nice lake for fishing, jet skies. Really anything nice enough and big enough to fit all those people within about 10 hours of Chicago.
I would like to day trip with canoe and catch some smallies if possible.

Joliet Jake,
Here is a place in Wi. just North of the Dells, it is a campground with cabin rentals.  Patti and Darryl run this 'ground. The family and I have spent many an enjoyable week/weekend here. Call and leave a message for best results during closed season.
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Each family might rent a cabin(there are several), check out what is available soon as they fill up quickly.  The White R. is just East of this campground for fishing, Lake Delton is also nearby(closer to the Dells). Jet skiing may be available? ???

Jim