A great way to see Toronto (even the locals do it) is to get on one of the street-cars. There are numerous routes. You can ask the driver for a transfer, get off one street-car, get on another, and do this for as long as you want for one price. They go fairly slow so you get time to see things as you are moving along. If you see something interesting, get off, have a look around, and then get on another street-car: it's great! DO NOT rent a car: the drivers are crazy (as they are in any big city).