It is listed online as a room only special. If I call will they let me add the dining plan if I am paying for it?
I think online is only the room-only code. You might try calling CRO to ask about the package discounts, which you can add the dining plan to. You will have to buy one day passes for everyone, too. But I don't think you can add dining to a room only deal without tickets (i.e. a package).