Ottawa in winter might not seem like the best idea as a tourist (it can get pretty cold up here) but a winter visit to Canada's capital would give you the opportunity to skate on the world's longest skating rink.
You can glide down almost 8km of ice through downtown Ottawa, with no admission cost. It's a unique experience, and worth the chilly weather. There are skate rental booths at various points on the skateway.
Skate or walk along, and make sure to stop for a sweet Beaver Tail pastry. It's a canal tradition.
