You can rent bikes on Mackinaw Island. They rent all kinds of bikes (Cruisers, 2 person bikes, etc). I was there last week but don't remember what the fee was. They rent by: 1. The hour. 2. 4 hours. 3. The day
The ferry service to the Island (3 of them) charge $22/person for a round trip.
If you take the horse pulled carriage ride it is $28/person (I think that was what it was) but you can get off at various stops (Like Fort Mackinaw) and back on without additional charges. If you want to walk on the porch of the Grand Hotel be prepared to part with $10/person.
We stayed at Indian River Campground outside of the town of..... "Indian River", and it is approximately 27 miles from the Bridge. Cost was $42/night but it will be somewhat less after the little tykes go back to school (Labor Day Sept 5). As I mentioned in a earlier blog there is lots of things to see and do. We went to Mackinaw Island, did some canoeing on the Sturgeon river, played some golf, and did some off roading in the State Forrests with the Jeeps. If you like Casino's there are a bunch of them in both the lower as well as the upper peninsula. If you like golf there are also many really nice courses in the Mackinaw area too.