Half our get-a-way was already planned for us. A while back I won a 2 night stay on Mackinaw Island that included ferry tickets and $100 Visa Gift card. We fiqured we should spend some of our own money (to keep Michigan's economy going --- I'm really good at this). We (I) decided that we should go to Traverse City for a few days also. With bikes in tow we drove up to TC, explored the area, went to Sleeping Bear Dunes, Old Mission Pennisula, beaches, and winerys.
After 2 nights in Traverse City we went to Mackinaw Island. Having our own bikes was much better then renting bikes on the island. Having gears made it much easier to navigate some of the hills toward the center of the island (the rental bikes are all single gear crusiers). The weather was perfect the whole time we were away, we couldn't have asked for a better anniversay get-a-way.