Take a Duck ride if you get the chance. Its a blast!
For those who don't know about The Ducks, its an old miltary amphibious trac. They run on both the land and water, are very noisy but cool. My kids loved it including the large economy one called husband. But be prepared for a chilly ride. Thats a day to day change. Go over towards Baraboo and visit the circus stuff as this is the hoe of Ringling Brothers. Don't know how your time is set up but Frank Llyod Wrights House on the Rock is well worth the side trip.
Enjoy yourselves. If it was after May 1st I'd suggest Old World Wisconsin but they don't open til then. You might also stop at HH Bennett Studio Museum photos are awesome as is the history of photography. Check with the local cheesefactories see who has a tour always educational.
Enjoy!
Laurie in Bradenton