I don't know of anywhere you an get rolls of coin. You could ask for an extra dollars worth of quarters when you make a purchase. If you make a few small purchases, food court of gift shop in your resort then you would have some change to start with. If your flying and have a connection you could make a small purchase and ask for some small change there too.
Have you traded any of your CAD money for USD yet?
I always ended up with a ton of change at the end of everyday and had enough to use for penny press next day.
I hope you have a nice trip.
Lori