I may want to cancel my ressie on Castaway Cay for the Stingray adventure. When is the latest I can do this? Can it be done as soon as I board the ship? Do you know what, if any, penalties there might be? We are going to Discovery Cove before our cruise, and if the Stingray interaction there is good, then I don't think we'll need it again on the cruise. But if its not, then I want the kids to get an up close interaction with them.