Like many threads like this in the past, this one is filled with "wear your PFD" advice.  Given the situation being addressed, wise advice.  What is missing is a strong sentiment for wearing something that protects against cold, such as a wet suit.

The news just reported on the person killed off Acadia in 55 degree water.  The report indicated unconsciousness occurs in such conditions in about an hour.  Early/late trips to Quetico probably encounter similar water temps.  Some kind of thermal protection is probably as important as a PFD, depending on the type of lakes crossed during the trip.