Berettaman, something to consider for the Dells.. If you stayed somewhere like the Wilderness..

If it rains you still have inside water parks, also you can just walk from your room to the outside and inside pools.No parking the car, no locker rooms, change differ clothes....

Also i know they have rooms with full kitchens they are spendy, but you will save alot of money on eating out. Plus the restaurants are way packed, expensive and just average food...

P.S. i own 20 percent of the Wilderness resort thats why i keep bringing it up.. LOL. There are other resorts that are just as nice... Hopes this helps what ever you end up doing the kids will have a blast...