I do enjoy the spirit of the Christmas season. It is one of giving and receiving which is a nice way to end the year.
However, my absolutely favorite non-religious holiday of the year is Thanksgiving. It is a time of family, food, and thanks. Everyone pitches in to cook/bake the feast for all to enjoy. It's a very low pressure day filled with family, friends, laughter, and fun. It prepares me for the busyness of the Christmas and New Year.