Just to clarify - at least for 2007 - the Premium and Platinum options work exactly like the Dining Plan. They can only be added to a Magic Your Way package. They length of the option is the same as the number of nights of your stay.
Park tickets are somewhat independent. You have to buy at least a one day ticket. But the length of the ticket - and whether you get hopping or no-expire options - don't depend upon the length of your package.