I take my wife and kids for a walk in a green area and play from the morning. We stop by a cafe to drink something and eat some sweets. We spend an hour in a nice bookstore, get some books and children activities like sticker books. Then we come back home, spend some time with our new treasures. Cook something nice for lunch and dinner, maybe also bake a cake. We chat a lot and everybody also gets some personal time for their hobbies. That is my perfect Sunday, and I am the luckiest man to have it most Sundays.