You'll certainly see a Tim Hortons if you come anywhere near MI :)  Some people say it's the best coffee shop, but I prefer Biggby's which is also in MI and Ohio so look for that one too!  They have the best frozen coffee drinks :)

For the heck of it, I did a search.

http://www.timhortons.com/us/locator/index.html

Choose "Michigan" and choose "within 10 miles" and you'll see there are over 100 in SE MI!  They even ran out of little dots to label them.  Holy cow