What should I get my wife for mother's day?

Mother's day is a great opportunity for a thoughtful gift. If she has a car, getting her car washed can be a nice surprise. You can pair that with a nice meal out, but instead of having her pick the place, give two or three suggestions and let her choose. If she often plans the meals, asking her to just pick the places without options is shifting the cognitive load to her and not a gift if she already plans the meals daily. If you would a gift to wrap and are not sure what she would like, this is where you can phone a friend or female family member and see if they have any suggestions for gifts. If none of these work for you, go to a store that she likes and around mother's days most stores will have items marketed as mother's day gifts. If that is still too much, Amazon will have holiday specific gifts and you can include gift  wrapping on check out.