I posted this in Travelbuzz but it got buried so perhaps I should have gone here intially.

My husband and I are thinking about going to Toronto the weekend the Yankees are there. If we do this, we will need to keep our costs to a minimum. We will Priceline a hotel (are the bids in US$ or CDN$?) and use their subway system. We won't need to rent a car in Toronto, will we? Outside of the ballgames, what are the important sites to see? Any help is greatly appreciated. Thanks.