Mackinac Island is pronounced Mackinaw.
I got extra credit in 7th grade history because our teacher was talking about Edinburgh and I told him he was pronouncing it incorrectly. He said "Really? show me." (Not in a mean way, he was a sweetheart) So I pulled out the encyclopedia and showed him. He was amazed. Know how I knew? I had a big crush on the Bay City Rollers in 6th grade.
Around here we have Russia (rooshie) Versailles (ver-sales) and Houston (house-ton). But we're pretty hick-ified in these parts.