Wisconsin is a beautiful state, althought the winter weather can be pretty brutal.
I used to work on world class yachts and there are 2 of the best yacht manufacturers in the world in Sturgeon Bay (Door County). Some of my clients had yachts built at Palmer-Johnson, so I used to travel back and forth from Florida to work on the boats.
While I was there I used to go out and explore the local area and also got to go fishing with some of the ship wrights I got to know.
Potawatamee (sp?) State Park is in Door County and there is an outcrop of the Niagara Escarpment that is pretty impressive. Sturgeon Bay was settled predominantly by Belgians so in July they have a big Belgian celebration, complete with fish boils (yum...some of the best food I've ever had), parades, fireworks, etc.
If you get a chance to check out Door County you'll definitely have a great time.