I had purchased 4 tickets (a few years ago) that have not been activated. I believe they were for unlimited visits during a 7 day period. I paid $99 each for them. We are planning to use them this summer. Can they be upgraded to an annual pass (since we will be returning once or twice to Orlando during the year)? And if so, do they give credit for the current price or do I pay the difference in the cost of an AP less the $99?