I live adjacent to the Coronation dog park. I thought that was a pretty amazing dog park until I visited this place. It's amazing Toronto has resources like this for the city's dogs.
I go in the early afternoon when it's not too busy. It's just a beautiful place to take a break in the middle of the day. Easy to park at, friendly people, and it's so big that it's like being able to take a walk with your dog off leash, not so much like a playpen as many dog parks are in the city.