All around help

Hi there my husband son and myself are travelling to florida on the 18th of december for 1 week and we are unsure on what park passes to get. My son is 11 and is more exited about universal studios than disney however we would stil like to go to disney so could someone be kind enough to give some examples of park passes i know he is also wanting to go to wet n wild.
It would also be helpful if i could have some information on the best places to be over xmas and will there be any firework displays?
Also where will be the best place to be xmas eve for entertainment?
Would anyone also be able to help me decide on if i would need to take suncream as im unaware on the weather over xmas.
Many Thanks