Let's say you're in Chicago for a convention. The sessions you need to attend end at 1:30 pm, but you have a few hours before you need to get to the airport. You'd like to do something interesting, but you've already been to the major tourist attractions in town. Should you just sit in Starbucks and hope there's an outlet to power your laptop? Heck no. We've put together a list of smaller museums and things to do in five top business cities.