OK. Daval, it was a toughy, but I've narrowed it down to THE CORRECT ANSWER!!:
this is the museum on Nancy Island near Wasaga Beach, called The Friends of Nancy Island Historic Site.
http://www.wasagabeachpark.com/
Having discovered this now, I can truthfully say that I have never heard of it before. And I grew up in Barrie, ffs.
Off to find a pic...
Here is a gimme... from my collection here at work:
