We celebrated our DD 7th & DS 9th B-Day there last year.
Make sure the resort is aware of the twins big day. DD & DS each recieved 5X7 pictures of thier favorite characters in signed cards.
Each park has thier own Birthday pins. It was a thrill for the kids to hear "Happy Birthday" all day from CMs and other Disney guests. CM gave DD a free soda and balloon. DS got a huge beer (empty of course) stien in Germany from a CM.
If your doing character meals make sure they are aware. We did Chef Mickeys for DD and Breakfastasaurus for DS. Both were GREAT!! At each, got big decorated cupcakes and everyone sang Happy Birthday. Some of the characters signed Happy Birthday in thier autograph books.
Also, a CM in a gift shop saw DD birthday pin at a gift shop. CM called DD to the phone & Goofy sang Happy Birthday to her on the other end.
Have a great time!!!
Shelby0007