Hello. I have an unused 5 day park hopper paper ticket for a child from UT from a few years ago but by the time we use it, my daughter will be 10. We will be there next month (using a different ticket). What is the best way to upgrade the ticket to an adult one? What will I be charged...the difference between the current child and adult ticket price for the ticket? Is there a best strategy to do this? Thank you!