Marquette, MI., home to Northern Michigan University, is about 2hrs (100 miles) by car from Oswalds Bear Ranch. Dean & Jewel usually fly from Marquette or Kinross(same distance but east Sault Ste. Marie, MI.)
The bear ranch is about 1 hour north of the Mackinaw bridge. The largest decent sized airport is probably Bay City. Still another 3.5 hour drive to the ranch. I suggest if you are out of state to consider a weekend on mackinaw island and the bear ranch. Note the ranch isn't open to public until Sometime in late May.
Thanks! Your answer is awaiting moderation.