dude... I live here in Wisconsin!
Things to see........

Lambeau Field/Packers Pro Shop.... (Green Bay) Packers are in training camp right now.... become a rail bird!

Green Bay Blizzard Arena League football games (right next store!)

Class A Baseball (Wisconsin Timber Rattlers) game at Timber Rattlers Stadium (Appleton)

Door County (careful around Ellison Bay... still picking up after the explosions 3 weeks ago)....... (Sister Bay, Washington Island, Sturgeon Bay, Egg Harbor, etc)

Wequiock Falls State Park, Red River State Park (just north of Green Bay... in Dyckesville) You can actually go down into the Falls and look up!

Milwaukee Art Museum, Mitchell Domes (Botanical Gardens), Miller Park (Brewers Stadium) Milwaukee

Cave of the Mounds near Madison (walking tours only)

Wisconsin Dells

Bluffs out by La Crosse WI/Winona MN (best in Fall)

SS Badger carferry (Manitowoc, WI over to Ludington, MI)
Door County is A LOT of walking....The others aren't that bad.