i think one of the main bouldering places in ontario is niagara glen, which is like a click downstream from the falls.
its like an hour from toronto i think. basically a large wood by the river littered with hundreds of limestone (yes andy, your favourite LIMESTONE) boulders. i went there once on holiday and only climbed at one little spot with no mat but though it was ace. see photos below.
the website for info is
http://www.glenbouldering.com/although i don't now how recently its been updated.
I can think of a lot worse places to live than toronto - i think its a decent city though Kim will dispute that. I think theres more climbing around ontario and also quebec i think. If you do go there then go and see some Maple Leafs games you jammy git.