The third Sunday in September is Wife Appreciation Day, a not very well-known holiday but one that calls for celebration nonetheless. Mother's Day gets all the attention, but married women who aren't moms deserve a little appreciation, too. So do partnered women with children. So, get on it!
Open the car door for her. It doesn't have to be done with a flourish or even every time, but once in awhile—maybe she's got her hands full or is tired or just because—open the door, let her get in and shut it.