Parc National de Plaisance is the best place to see migrating birds in Western Québec.
Here is a description from their brochure (if you are in the mood to try out your French).
Une visite au parc national de Plaisance crée des souvenirs marquants inspiré par la beauté, la diversité des paysages et le calme des lieux.
Migration had finished long ago on the day of my visit and I did not see one aquatic bird or gull.
Cedar Waxwings, however, were in abundance.
Cedar Waxwings are the most nomadic of birds. I have seen dozens in all seasons for a few days and then none for months.
I saw 2 plant species here for the first time. Both thrive in floodplain environment:
How doth the little busy bee
Improve each shining hour,
And gather honey all the day
From every shining flower! – Isaac Watts (1674–1748)