When I was a kid we visited Montreal for Expo '67. Of course, the big thing I noticed was that it was all in French, but I thought that was pretty neat. You could buy Jules Verne books in the original French in the bookstores.
Much later, when Lived in upstate New York I visited Toronto and Hamilton. The road signs in kilometers and the speed limits in km/hr didn’t throw me – it was a simple exercise in quick calculation. Ditto for the money and the exchange rate. What did surprise me were:
1.) milk in plastic bags! (and you had to have your own pitcher/holder for the, after you snipped off one corner)
2.) The “shoebox” cinemas at Eaton Center that held about 25 people each. And a lot of the films were Canadian or British films that never seemed to make it to the States.
3.) There was a certain indefinable something about the highways that indicated that you weren’t in the US. I don’t know what it was – and I don’t mean the metric signs or anything like that.