I'll be there on Sept. 3rd too! I went with my 2-yo in February and it was tons of fun!! I didn't get to do too much though because she fell asleep pretty early, but we did get to meet Jack Sparrow.
If you don't mind missing the fireworks, try to meet Jack during the fireworks. They were telling me people were waiting over an hour and a half to meet him -- we got in line about 10 minutes before the fireworks started and only waited 10 minutes. We missed the first few minutes of the fireworks but since DD is terrified of them, we didn't mind at all and still got to see most of them, admittedly from a distance but still. It was lots of fun, we love the candy/bead stations and seeing all the little princesses and pirates. I'll have one of each this time, plus my parents will be there to take the little one back to the hotel when she gets too tired so we can stay all night! I can't wait... can you tell I'm excited?!?
I wonder if they'll be doing anything extra special for 9/03 since it's the last night of the party? Maybe giving out extra goodies or something.