This is your reason to get out to the East End. If you've walked around all the trails you know, you should head on down to Riverdale Farms and just walk around the area. One of the highlights is seeing the old Zoo Pens, and learning a little bit of Toronto's history.
There are so many secrets waiting to be revealed here. But, you know, if that's not your thing - who doesn't love seeing the animals, and watching them run around? Children love it, adults love it... there's no reason not to check it out.