Tons of businesses (especially chain restaurants) offer rewards during your birthday week/month; most of them require you to sign up in advance, so don't wait until the night before to plan out your TOTALLY FREE DAY. And it never hurts to double-check with an establishment ahead of time in case a deal has expired or changed.
3. Delta will give you $100 off a trip booked through one of their vacation packages during your birthday month.
5. Starbucks Rewards members receive a free drink.
You have to sign up at least 30 days before the actual day, though, so get on that.