I'm thinking about booking a package through Costco because the prices are quite decent compared to buying it all myself. Only issue is, there is no availability the first few days we'd like to stay. We're happy to stay somewhere else for those days, but the tickets that come with the package only start from the day of the package. Has anyone found a way around this? I know I could pay for another few days of tickets, but it'd save quite a bit if I could just extend the package tickets.