It might seem like a chore but if you have to pick up souvenirs for all those friends back home, this is an ideal one-stop shop. Canadian Maple Delights specializes in all manner of maple-syrup-flavored goodies (think maple sugar, maple tea, maple-leaf-shaped candy, maple-tree-growing kits etc). It also stocks vacuum-packed salmon for those who don't have a sweet tooth.
You'll find several additional large souvenir stores nearby if you want to get your list covered off in a single afternoon. Just don't buy the moose-dropping chocolate candies, go for a T-shirt that makes jokes about beavers instead; that's much more sophisticated.