hey, welcome to fluther. and also, welcome to montreal (im from montreal). canadian beer is good, but some americans cant get used to it. try boreale blonde, mousehead, rickards red, molson (true canadian beer), and whatever you can get at a depanneur. these are mostly unique to canada, so go ahead and try a variety.
and one more thing, go to les 3 brasseurs on crescent and st. catherine and order a meter of beer (a plank 1 meter long that has 6 glasses on it). les 3 brasseurs makes their own beer and its really good.