1. DO speak in a LOUD, clear voice. No mumbling!
2. DO try to work in all conversations how things are much better in the US.
3. DO assume that everyone speaks English at all times.
4. DON'T try to speak in their own language as that just encourages them and you won't understand anything at all.
These are only a few of my rules, but they work like a charm.
Oh yeah! The most important part is that after you follow all these rules, DO let everyone know that you're Canadian. This prop helps...