From the Columbia thread:

Quote Originally Posted by DetroitPlanner View Post
Combine Boblo with having to compete with Cedar Point and the fact that nearly all small amusement parks are now extinct and you begin to realize why the boats were mothballed in the firstplace.


Got me thinking about Edgewater Park on W. 7 Mile near Telegraph.

http://apps.detnews.com/apps/history/index.php?id=104

Any others?