I don;t think you can bring your bicycle into TTC during rush-hour. Do you plan to ride from Scarborough into TO?
You really need to fence off a day to visit Toronto Island. No cars! Just paths everywhere. There's a small community that lives there. Very quaint.

If you have a few days, you ought to consider taking a side trip to Niagara On The Lake. Then bike the scenic route all the way into Niagara Falls. You will not regret it. US tried to invade Canada because of that stretch of jewel.