Adding people to Play 4 Free

[Lisa3]

Does anyone know if I can add park tickets on the Play 4 Free deal and if so how much they would be? We may have to change our reservation to "in season" rates and this would be a better deal cost wise but I technically have 4 adults (kids are 12, 11 & 9) and one child. The deal is for two adults and two children. Can I upgrade one of the kids' tickets and then add another adult ticket to this package. I don't quite understand why they break out kids and adult tickets in the package when there is no difference in price on the web site when you just buy tickets.