Do I see Canada in the Distance?

It's a little hazy right now but it looks like a summertime week-long trip to Canada might slowly be taking shape. We'll probably be staying in a small town near the St. Lawrence River and will be within easy driving distance to Montreal, Toronto and Ottawa. From what I know, all three cities are completely different - each has its own personality. If you were to rate the three cities (in terms of which ones to visit), how you would you rate them? More importantly, if you had 1-2 days in a city, what would you do/visit?

I currently have Montreal at the top of my list. The old town of Montreal looks amazing and the food sounds tremendous. Besides, we don't have any trips scheduled to France so, for the time being, this will have to do.

Any tips?

And, oui, je parlez un petit peu de Francois.