There are LOTS of great shops in Wisconsin...do you have an area you know you are going for sure? Or what route? I have heard that Wisconsin has the most quilt shops per capita of any state in the country. I am in the Fox Valley area, and we have 6, and Green Bay to the north has 5.
There are also a lot of barn quilts in Wisconsin. I know there is a website that has a list of states with barn quilts. They are really becoming popular, and people are now starting to put them on their houses also.