My DS turned 11 on our recent trip to BWV. I didn't let them know ahead of time, but did when we checked in. They didn't do anything, which really didn't matter to us. We celebrated his birthday at Discover Cove, where they gave him a free birthday smoothie. We also had dinner at 50's Prime Time, where our waiter sent over a table of 4 teenage girls to sing happy birthday to him and deliver his cupcake. Finally, we had sundaes at Beaches and Cream, where they sang happy birthday and gave him a balloon. I have heard of some resorts doing something special, but you may have better luck at the restaurants. Just let every place you go know it's your birthday celebration, and you are bound to have some fun!