Here's a list of some of the great things you can get for free on your bday (without strings attached or purchase required)
Red Robin email club (free entree on your birthday)
Sonic (free drink or tots on your bday)
Ihop (free rooty tooty meal or substitute of equal value)
There are many many more, I would suggest going to your favorite restaurant or place of business's website and see if they have an e-club, then if you are worried about spam, set up a free account somewhere like yahoo so you can save that for your bday emails!