A friend has a one-year job in Alma, MI this year, so my wife and I are visiting here there this weekend. We're flying into Grand Rapids just in time for dinner, then spending three days in the middle of the state, on one of which we'll probably go to Detroit. Any can't-misses in those three areas? We're pretty adventurous. Probably not up for super-duper fancy, but any price range is OK. Thanks!