I bought my tix through Disney (part of a pkg... YES, the pkg actually was the better deal this time) and assume I will be getting them when I arrive for check-in. I bought 6 day expiring hoppers. Now, I'm thinking for the extra $5 it may be worth to upgrade to 7 day exp. hoppers... so we can head into a park our first afternoon/evening there, if even for a few hours.... Can I do this at check-in before I actually use the tickets at all and only pay the $5 difference?