And by this I mean state parks where you can hike etc, I've visited Devils lake and thought it was fantastic, as well as the one up by appleton, any other nice parks would be nice to know for the summer
Check out places in Door County. Also, Northern Wisconsin is gorgeous in the summer time and extremely peaceful (just make sure to bring bug spray!). Mirror Lake in The Dells is nice too.
I'm going to move this over to North & South American Social.