If you can go to Pelee do so. Little late for the birds I would expect but you should still see lots of Pheasants. Pelee is known as one of the top birding areas in North America. That is if birding interest you.
If you like Ketchup, before getting on the ferry that takes you to Pelee, you should visit the Heinz 57 plant. There is a little known souvenir shop there.
Adrien