Encourage your child to write a letter/email to Santa, write thank you notes for presents they receive and make cards for family and friends.
Make a wish list for gifts they would like.
Make gift vouchers like- I will help with washing or drying the dishes for 2 nights, feeding your pet for a week, tidy my toys each day and make my bed etc.
Keep a diary of holiday events- where you went and what you did. This will help them remember, especially when they go back to school and need to share this.