Back when I was living in Toronto I used to head out to Burlington by GoTrain to train at the Burlington BGs gymnastic center. Its a bit far from downtown but the train system is pretty good. Took me about an hour from my apartment on Spadina to get to Aldershot station in Burlington.
http://www.burlingtonbgs.com/
They let us do pretty much whatever we wanted at that point. Wallflips, wall plant off tramps, doubles, hell there was even one dude trying triples into the foam pit. I haven't been since I moved out West a few years ago, but hopefully they're still pretty lax with the rules once you get to know the coaches.