The McGulpin's Point Lighthouse is about 3~4 miles west of Mackinaw City as you head on the main east-west street of Mackinaw City. You turn right at a horse farm and just as you pass the farm, the lighthouse will be on your right.
When I first found this lighthouse, it didn't have the lantern and you couldn't visit it.
The lighthouse was built in 1869 and was deactivated in 1906 as it was replaced by the Old Mackinaw Point Lighthouse in town (there is a pretty good view of the Bridge from there too). It was a private residence until 2008 when it was purchased by Emmet County. This year, they replaced the lantern and opened it to the public.
This is an overall shot of the lighthouse. It is in a fairly wooded area, so you can't get a good angle to get a good shot. But it's a very nice lighthouse.
A closeup of the tower.
A shot of the tower.
A view of the Bridge from the Tower. It's not a bad view and worth the climb up.
Looking down the spiral staircase.
Looking up at the staircase. Both are pretty cliche shots.