Go to Montreal then Quebec City

There are a few famous churches in Montreal. Also visit the Mount Royal, McGil University. Old Port is the best place in Montreal in my opinion. Driving around especially on the University Street is quite fine. You'd also need a car to go to Olympic Stadium, Botanical Garden.

Quebec City is much better than Montreal in my opinion so go there after Montreal. The old town needs a whole day to go around and is totally worth it. Once there you won't miss much. There are also some falls, etc.

Canada is much like the US. 信用卡 is just fine. Give tips the same way in the US as well.