Mackinaw Island, boring? I disagree. Birch Run outlet shopping? Now that is boring!

You can shop in outlets just about anywhere. Mackinaw Island is definitely a unique experience, and as a kid I loved it and of course still do. There is so much to see and do, and definitely cross the Big Mac bridge. You can't do that "just anywhere" either. The ferry ride from Mackinaw City to the island is something the kids would enjoy, and riding rented bikes around the island, and taking one of the horse/carriage tours too. There is a butterfly house that is fun to go in, and of course buying fudge. On certain days you can tour the governor's mansion. And there's the fort to go in too. There's a nice fort in Mackinaw City as well, and all the souvenir shops. If I'd never been to Michigan, the Mackinaw area is one I would definitely want to see while I was there.
The famous restaurants in Frankenmuth, that serve the wonderful broasted chicken, are Zhender's and the Bavarian Inn. I prefer the Bavarian Inn over Zhender's. My Mom and I had lunch there for her birthday last month and we enjoyed the accordian player who went around the room, and the servers in their German outfits. They have a lot of nice shops in the lower level too.