The public library is fucking solid gold - central branch, that is. There are a million nooks and crannies set up with comfy chairs facing each other, cozy enough to develop some tension to break, while open enough for girls to feel safe talking to you. Tons of lonely students from around Canada and the world, and cafes downstairs for a smooth transition. Pick a book you like and girls just start appearing around you, sitting down, reading, and sighing. I love the library - It's like the architect designed it for meeting pretty young girls.
Helps if you're a reader, of course... I always go there with my to-read-list and spend an hour or two just checking out random books of interest, especially reference books (you can never borrow the best books!), because I love doing that, and so getting a number or a coffee date is a nice little bonus