There is a toronto subaru club that has different regional meet ups but dont think anything off road oriented. it is mostly the wrx / sti guys / gals
I know some unpaved roads which are fun to do ... we can probably hook up
I've done some trail driving in my OB, mostly to get to camp sites. I found this awesome area that is Crown Land, which means you can camp for free. There are a ton of logging roads, which makes for great driving trails that are easy enough for a stock OB, but beautiful and fun to drive. Only a few hours away from Toronto. This spot is a boat launch at the end of a really nice trail, which has space for a car or two to camp, and there are a bunch more nice logging roads around there for fun drives. I can't post links yet, but the coordinates are 45.022661, -77.589982. Enjoy!