My question has not been answered on another topic a few threads down. If I were you, I would call the hotel first to make sure you would actually be getting 2 adult and 2 children tickets. The wording on the website states "up to". I take this to mean you get up to 2 tickets based on the number of people you have in that age group. No small kids?....no kids tickets. Only 1 small kid?....only 1 kid ticket. If you call the hotel, please give us an update on this topic. I'm interested.
And to answer your question. I was told no, you can't use 2 kids tickets to make an adult ticket. Sort of a bummer for those of us with older kids.