Actually, make a reservation at any of WDW restaurants (preferably the one that you and your child like a lot) and let them know while you're making that reservation that it is for a birthday. They will do little things to make it extra special. When I had mine at Tony's, they sprinkled the table with Mickey ears glitter, and of course, at the end when we were having dessert, the wait staff announced to the whole room that it is my birthday.
If you can get a reservation at Cindy's restaurant, your child may even get a card with his name on it (not sure if they still do this here, but they did about 2 years ago).
Zz.