Rated this place:
725 Logan Avenue, Toronto, ON, M4K 3E4
Farmers market, Kids toboggan hill: On Saturday mornings you can get fresh, local produce and amazing bread, cookies, cheese, honey and more, and take your kids to a great playground at the same time.
It's not too crowded, it's big enough to get some good speed, but small enough that you can send your kids down on their own (and they can walk up it on their own as well)