Not much to see here in Michigan, but like WWCD101 said, it is a good place to see the Great Lakes.
The Henry Ford Museum is in Dearborn and the Kellogg's factory is in Battle Creek if your into the American industry type things. From here you are just a short road-trip away from the east coast. Just don't come up to Flint, everything moved away from here. Move along, nothing to see here.