I'm traveling through Detroit, what is there to do? My wife's cousin lives there, and she keeps saying there's tons to do, but then not telling me anything. I have 48 in Detroit with no plans. Any suggestions? I love museums, farmers markets, you name it.
It's not in the city, but if you have a car go to Dearborn and check out the Ford Rouge Factory Tour - it is fantastic. Henry Ford Museum is great as well - lots of great historical items (Abe Lincoln's bloody chair, Rosa Parks Bus, old cars, lots of trains, etc).
This is kind of random but there's a lot of pretty cool saltwater aquarium shops.... Tropicorium is one of my favorites, it's kind of like going to the aquarium but no charge! Plus its right by the airport