http://www.forbes.com/sites/jesselawrence/2014/07/17/notre-dame-leads-top-25-most-expensive-college-football-tickets-on-secondary-market/
Found that kind of surprising.
Also, check out the photo for Iowa at #11. Made me laugh.
I don't think I've seen anyone mention this specifically, but one really good idea if you have maybe 3 hours or so on a nice day would be to start down at Minnehaha Falls (which was mentioned) and rent a couple of the Nice Ride bikes. There's an amazing system of trails that go out from there...