Hi CruiseFan-85. I'm a veteran of five Canada/New England cruises, and have experienced all kinds of sea conditions -- sometimes even on the same cruise! As carlg stated, every week is different. The ports are the real draw here, and they are superb.
An apple has always worked well for me to combat mal de mer. (Which, I've experienced to Bermuda...not Canada.) A crew member told me about it years ago. Best things about it are that apples are plentiful, free, and have no side effects.