I hope this advice does nto come too late but take advantage of the Fastpass in Magic Kingdom. We were there this past weekend and it really saves you time from standing in lines. SeaWorld is fun and they have a great nursing room/potties in the children's area next to the Shamu stadium. We have season passes to SeaWorld and Busch Gardens because we live 10 minutes from Busch Gardens in Tampa. I would also recomend that you buy a jogging stroller and not rent it from Disney, they run $15 per day for a sigle and $31 for a double which is outrageous. I also suggest that you go to the Disney outlet store in the outlet mall on International drive instead of buying gifts in the Disney parks, it is much cheaper.
The parade in Magic Kingdom is different at 3pm and 8:15pm and it is worth seeing both. If you plan to stay for the late parade take sweaters because it does get cold.
Alexia