The Steam Whistle Brewery is great! Unlike the other breweries in Toronto, this one is really art driven and fun to have parties at, which they regularly host.
It's a bit far, behind the Sky Dome but worth the trek in the summer.
There's tours and stuff and sampling of course, but the space itself is just really ballin' like a giant loft space with friendly staff who seem to really like their jobs.
Probably a great place to work as a summer job if you were in school or something.