ooo, disney...
i dunno what you would like there, or what kids would like, last time i went, my brothers were 11 and 9.
i do suggest doing a large park, then a smaller park, then a large park, then a smaller park. that way, you dont completely exhaust yourselfs two days in a row. epcot and magic kingdom are bigger, and animal kingdom and mgm are smaller.
and fastpass is a good thing. believe me.