Okay, I'm an no expert on 'canyons', but here's a few examples of what I think constitutes urban canyon in Vancouver (ALL TAKEN BY ME!) after looking through my vaults:
Perhaps Georgia Street is the best example I have:
Looking west up Georgia:
Fog shot, looking east:
Hastings Street, looking east:
Granville Street, though I'm not sure if this would count:
And again, at night:
One-sided apartment tower canyon...?