Living on the west coast, Vancouver's the easiest to get to -- I love Vancouver (and Victoria), and I've been both places several times, and I've gone to Whistler a handful of times as well, but, again, it's a lot like where I grew up in Seattle.

I really do want to visit Montreal sometime, but I also want to visit Chicago and Memphis and a lot of other "domestic" locations that I somehow never find the time for.

Also, when you grow up in a country you have a lot of local knowledge from culture, friends, television, education, so we just know a lot more about domestic places we haven't (yet) visited. Plus, a substantial number of people don't have passports. We used to be able to visit Canada easily without one, now we cannot.