<p>Western is the biggest party school in Canada.
Laurier probably has the highest girl:guy ratio.
University of Toronto and McGill will provide you with the parties and entertainment off campus (and these two are the better schools in Canada/higher ranked).</p>
<p>I would say it should come down to what program/major you are looking into too. If you are a business-guy/girl then Western is probably your best bet (Ivey + party school).</p>