If you are not a nature lover, I'd wager you are going to find it pretty boring. Not much to see up in the northern towns. I think Whitehorse tries to promote its gold rush heritage but that's about it. St. John's is probably the best bet as you can walk around the city. Gander is just really an airport in the middle of nowhere. Goose Bay is better known as a site for a nearby military air training area. Ft. McMurray? If you want to see (and smell) oil extracted from tar sands.