Um - Canadian here - it is customary to tip at restaurants (why, I don't know since they get paid wayyyy better wages than in the USA). The few times I've taken a taxi, I tip. I tip my hairdresser (again - I don't know why, I never have anything fancy done, but I only go every 9 mos or so - thank goodness for long unfussy hair!). Back when we used to get delivery for food, we'd tip the drivers/delivery guys.
I've never done any guided tours or stayed in hotels where there are door men, luggage porters and valet parking, so I'm not sure, but I imagine people tip there as well...
So, yeah, there is def a tipping culture in Canada...
For the record, we did a private day tour with Sorrento Silver Star Car on Amalfi Coast - not cheap, mind you, but I did include extra for the wonderful driver...we also hooked up with one of those guides outside the Colosseum for a tour, but I honestly can't rem if we tipped or not - it was 9 years ago now.