Dude, Chicago. How can you forget Chicago?
It depends on how far away you want to go, really.
There are plenty of fun, albeit off-the-mark things to do in Michigan.
I quite like the Upper Peninsula. There's camping, boating, beautiful beaches. Nice weather in the summer. If you like nature stuff, it's pretty fun.
If you have a passport, go to Ontario. Ottawa, Toronto, Windsor. There is a whole other country up there, you know.
-------
And while the seagulls are crying,
We fall but our souls are flying.