K..
We did dinner at Goofy's Kitchen & told them it was DD's b-day - they brought out a cupcake for her with a lit candle & sang her "Happy Birthday". She also got the princess treatment at the Bibbity Bobbity boutique. When you get there, you can get your son a pin indicating it's his birthday, so he will get acknowledged all day at the park. It's already so special, I don't think you need to add that much.