There are several things you can do to appreciate your wife on her birthday. These are- breakfast in bed, give a foot massage, leave some notes around for her to find (she will feel loved and cherished), arrange your work schedule to give her some 'Me' time on her birthday by handling the kids and household chores while she goes out to unwind, gift her a spa experience, enroll her for a hobby class or for anything she is passionate about but doesn't get time to do, send her on a shopping spree with her friends/family, cook for her, whisk her off to a mini vacation or staycation.