I planned everything and she never had a clue....We also had ours planned for mid December.
When I packed away the Summer clothes I just stuck them in a suit case instead. I had her 3rd grade teacher in on it...So she helped pull it off and give me some of her work she would miss.
DD thought she had a dentist appt on the Wednesday afternoon. We stopped and picked her up at school early and she knew something was up when Daddy was with us and my Mom and Dad??? So when she got in the truck she said " What are we doing???" I said well I how about we blow off the dentist today and do something fun?????

She said cool!! How about the Zoo? I said how about something even better? I said let's go to Disney World!!!!!!!!!!!!!!!!!!! She just looked at me

For real she said?? I said why not? Papa will you drive us too the airport? he was laughing and like sure... Then she just started freaking out!!!

Are you serious?? OMG!! for real she just kept saying? So I said look in the back and she saw the suit cases and then she knew it was real!
She never had a clue, but then she did start questioning what I packed...Typical girl even at 8. Luckily my Mom caught all of her reaction on tape and it is so funny to watch.
She was totally surprised and now when she really does have a dentist appt I have to reassure her that we are not going to Disney...
We also had planned a 3 night cruise with our 3 days at Disney...It was a great trip except we had rain at
MVMCP and that was a bummer.
Have fun! Someday I am waiting for a someone to surprise me!!!

Probably won't happen since I am the planner.
Michelle