Michigan is a great place to cycle. The state has 2500 miles of bike trails, and some nice quiet roads in the rural areas. It is pretty easy to "roll your own" tour. My wife and I did two tours there, and both where very good. The first was a little over 900 mile loop around the Lower Peninsula. The second was a finish to a longer tour where we hit Michigan at the ferry terminal in Ludington, and rode across the state to Detroit. The people were friendly, the drivers courteous, and the rides were good experiences for us. Regardless of how you decide to do it, I don't think you can go wrong.