We just got back from Disney with our just turned 3 year old. I think alot of these tips still apply.
I took disposable sippy cups. I put 2-3 in a ziploc and took them each day to the park. I found that many of the counter service places have huge screw top lid containers of milk (we split it between 2 kid). Animal Kingdom doesn't have lids! I just threw out whatever he didn't drink. This is one of the best things I did!
I also made up diaper changing packs disposable changing pads (Babies R us has big packs), sandwich bag w/ 2 wipes (one for bottom & one for hands), and a diaper all in a quart size ziploc. I found that 3-4 of these worked great. You may want a small ziploc of just wipes for smaller messes. My husband often changed my son while I took care of my daughter. It made it go alot faster! Maybe if someone doesn't need to use the bathroom have them change your daughter.
If your daughter likes juice boxes make sure to bring the favorites w/ you. A couple a day w/ milk & other drinks works well. The same goes with snacks...I took a variety and all he wanted was fruit snacks & pez candy.
I would also have meal items she likes back at the room. My son ate 2 doughnuts one night for supper....I wish I would have had lunch meat or something else for him! I know not healthy but he wouldn't eat when we ate & fell asleep during some meals.
My son loved: Dumbo, Pooh Ride, Buzz Lightyear Ride, Mickey Philharmagic (this one everyone absolutely loved we watched it at least 3 times and my son said more duck!), parades, Pocahantas, Cinderellabration (stage of the castle) ,Playhouse Disney, and fireworks. There are more....I just can't think of them all. He loved the pool at our resort too! We bought pool toys that are Nemo at the living seas & he had a ball!
I wish I would have dressed my son in sweats for night parades. He often fell asleep on the way back & I wouldn't have had to change his clothes back at the hotel.
Do not make to many priority seatings for early morning. We needed to sleep in a little some days. The Crystal Palace w/ Pooh, Tigger, Eeyore & Piglet is very nice w/ great food! Chef Mickey's Dinner was ok...food was better & cheaper at Crystal Palace. I would also plan them for early in the trip. It seemed like as our trip went on my son did worse & worse at them. I've heard the princess breakfast in Epcot is very good. Cinderella was nice...food wasn't great, but the atmosphere was awesome!
Take special or expensive items out of your stroller! My son's favorite stuffed animal was stollen! It wasn't fun on the ride home!
We bought a leapster as a birthday gift for my son and that helped keep him entertained on the plane, before shows etc. He also loved a spinning top and bubbles.
If you fly be sure to gate check your stroller. They will have it ready for you when you get off of the plane! It saves a lot of back pain!
We also saved a spot for the parade and I sat there. My kids went with dad and got to do stuff while I waited! One night before the parade they saw County Bears! We also utilized fastpass! I would get one whenever you get to the park. The time span for us was generally 1 hour from the time we got it and it is good for 1 hour. You can ride some stuff and come back & get to the front of the line. This is another thing to do right before the parade....after the parade you can walk right on!
We also tried to do things that were close to each other. The following worked out very well for us: Beauty in the Beast and then you walk around the corner to Fantasmic (it may depend on the season if this would work or not). We also did that with Lion King straight to Pocahantas.
It also helps just to be back at the hotel for awhile. We went back one night just for an hour and it recharged us all! Take time to swim if you can...my son loved that...as much as other things! The hot tub does wonders for mom & dad too!
I also tried to be out & about during nap times right before our trip. It helped get my son used to sleeping in his stroller.
Your daughter may not sleep sound. Our son kept waking up....it helped to hold him until he fell asleep. I brought night lights and that was very helpful.
If you can stay at a resort that has monorail or boat service. We stayed at Wilderness Lodge & it was wonderful! It cuts down folding your stroller by about 2/3 if you go to Magic Kingdom alot. My son always fell asleep on the way back. When you ride on the bus you have to fold your stroller up and get everything out of it! That's hard w/ a sleepy child!
Anyway....enough rambling....have a great trip! My son did great...I'm sure your daughter will too
