Exactly! Another thing that works out nicely is casino flights. They were the cheapest way to get to the Bahamas from Florida, for example.

One thing to be careful of is to remember that -- unless your credit card doesn't charge conversion fees -- that you'll have some extra charges on the hotel or anything else you pay for by card. If you've got one that doesn't then that's the best because you'll avoid any exchange costs. U.S. currency is generally accepted in Canada but obviously you're losing money that way or if you have to get cash exchanged.