Some of my favorite short trips from Ann Arbor were out Huron River Drive to Dexter, or Whitmore Lake Road to Whitmore Lake, My very first tour, with no preparation, was a weekend loop out Pontiac Trail to Waterford, about 50 miles one way. Some touring we had done in Michigan when we lived there in the 1970's were: out to Port Huron and to Sarnia and along the the Lake Huron shore to Tobermory and on to Sudbury, then train to Toronto; through Windsor to Kitchener; to Midland, then through Saginaw to Port Austin and back to Detroit through the Thumb; and some short 1-2 day tours out of Ann Arbor, including to East Lansing and to Pontiac Lake. The only riding my wife and I have done in western Michigan was a round trip ride from Cheboygan to Mackinaw City, Harbor Springs, Petoskey, Traverse City and back by way of Douglas Lake.
Most of my riding currently when visiting Michigan is in Macomb and Oakland counties. When I have done some long training rides (> 60 miles), I have taken the bike to Stony Creek or Kensington and done laps as well as occasionally ride outside the park. Once I did a loop from Fraser (where my mother lives) down Jefferson, around Belle Isle, then out Woodward to around 14 Mile Road and back.