Many restaurants offer complimentary desserts, drinks, or meals for your birthday! Most require online subscriptions and then they will email you your coupon for a free item. Others you simply have to mention your birthday while dining in and you might get a candle and a song to go with your dessert (Macaroni Grill, etc.). Here is a list I've complied with the help of FREE birthday promotions.
Auntie Annie's Pretzels
Burger King (kids only)
California Pizza Kitchen (kids 10 and under only)
Cold Stone Creamery (BOGO)
Papa Murphys Take 'n' Bake Pizza
Kmart Kids Birthday Club
Toys R Us Birthday Club ($3 off a $3 purchase)
The Children's Place
There is even a beta version of an entire website called Birthdayfreebies.com dedicated to Birthday Specials. Click HERE to sign up and plan for your free day out. Most companies give you a window of time so that you are not expected to come in only on your birthday day.