For a traditional Christmas card, start by addressing the envelope with the recipient's name, followed by "Merry Christmas" or "Happy Holidays" depending on the tone of the card. If you want to add a personal touch, you can include a note inside the card that says "Dear [recipient's name], I hope you have a wonderful Christmas and a happy new year." If the recipient is a close friend or family member, you may want to add a more personal message such as "Dear [recipient's name], it's been such a joy to celebrate the holidays with you."