The Detroit Film Theater (in/connected to the DIA. Beautiful.)
http://www.dia.org/detroitfilmtheatre/14/DFT.aspx
The Charles H. Wright Museum of African American History
http://thewright.org/
The Detroit Historical Museum
http://detroithistorical.org/detroit-historical-museum/plan-your-visit/general-information
If you park behind the DIA ($7), all three museums are within close walking distance. Protip: try to get to the DIA early. The small parking lot fills up fast due to the exhibit.
(The Detroit Public Library is across the street if you want to pop your head in.)
Other ideas:
Belle Isle
http://belleisleconservancy.org/
Detroit Riverwalk
http://www.detroitriverfront.org/
Eastern Market (Crazy busy, though. For someone who doesn't know the area, parking will be difficult.)
http://www.easternmarket.com/
Boat tour (Never taken the tour, but have always wanted to.)
http://diamondjack.com/
Walking tour of Detroit (I can't vouch for this company...I have never been on one of their tours. It is free, though!)
http://www.puredetroit.com/index.php/architecture/pure-detroit-schedule-for-october-286.html
People Mover (I have always boarded at Greektown. You can also visit Greektown and the casino here. Plenty of parking and restaurants. If you love pizza, go to Pizza Papalis for some deep dish. Also in the Greektown area is The Old Shillelagh, if you want to get your Irish on! 
)
http://www.thepeoplemover.com/
Pewabic Pottery (Uniquely Detroit/Michigan. You will see a lot of Pewabic tiles/artwork all over the city.)
http://www.pewabic.org/visit/
If you go to the Renaissance center, make sure to ride the glass elevator! 
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