Excellent Castle
Casa Loma is a must see in Toronto. Everytime people come to visit we drive to Toronto to see the castle. I never get tired of it. I especially like the secret passages that you are actually allowed to use. Nothing is off limits at the castle which is very nice. It closes pretty early....I think around 5 pm, so don't wait til the evening to go. Also, be sure to take the underground passage to the stables that goes under the street. It is very cool!
Have fun in Toronto. :)