We had my daughters 6th birthday at Disney a couple of years ago. We had breakfast at the castle with the princesses, and dinner at Chef Mickeys. Honestly dinner at Chef Mickeys was more fun, of course it's kind of a festive place to eat anyway. Mickey brought her out a lite cupcake and they gave her a special birthday placemat that we still have. Since she got the cupcake and there was a ton of dessert everywhere, I didn't mess with getting her a cake that day (we had one at home with her friends about a week before we left). We did get her a birthday button and few CM's noticed it and said some sweet things to her. What could be more fun than a Birthday at the "World"! Have fun!