I know I am late. I just read all of your updates. Your children are beautiful and I can totally relate to having the dramatic daughter. I have a friend from college who has 2 daughters and one day he posted on facebook: "Little girls have more drama than TNT". You know the station with the slogan: We Know Drama.

All of our friends with daughters started commenting on it.
Oh as she gets older you won't get bored. Mine is 9 now and sweet and sugar and just as loving, but got a diva gene from somewhere. I have to laugh. She's also very creative and an amazing big sister. My son is also my snuggle bear and I can relate to your heart ache. Hes only 2, but it seems like it went by so fast. Even my daughter sighs thinking about when he was smaller. On the other hand, we do travel much lighter. Your son on his first trip reminded me so much of my son on our first trip.
We are headed down for our next trip on the 21st, just a few days after you return from yours. We are beyond excited. Well, dd and I are. My son has no idea anything is going on because no suitcases have come out yet. Hes well-traveled enough to know what that means though. He is completely obsessed with The Mouse though and we are more than ready for some time away.
Our first trip to WDW was a surprise for my dd and I also did a surprise short trip to Sea World, so I understand how much work that is. Thankfully I have a walk-in closet that allowed me to pack without her knowing. This time shes been in on it from the beginning. And funny, its been me asking her each day how much longer instead of the other way around.
For the heat, well use sunscreen, wear light colored cotton clothing, have misting fans, drink a lot of water, wear various hats, the children have sunglasses ( I wear eye glasses) and well take frequent breaks to find shade and/or AC. Well also do most of our touring in the mornings into the afternoon, then either take a break and return for the evening (2 different days) or end touring at 2 or 3 and spend the rest of the evening at the resort (4 different days). On our arrival day, were touring in the evening only. We are not commando by any stretch of the imagination. We are probably the exact opposite. But it allows us to stay rested.
I hope you all have a wonderful trip.