The Paper Discovery Center in Appleton looks like a great place to visit, even just because it is different from every other museum in the area. There are hands-on exhibits, all related to paper. I actually was there once when I was much, much younger. All I remember is making my own paper. I must have enjoyed it to remember it, though!
Paper Discovery Center
425 West Water Street ~ Appleton, WI ~ (920) 380-7491
Admission: $6/adult, $4/student