Here is their wonderful stationary that Macy's has too. Simply print it out and have the kids write their letters. We all pack up and head to mail our letters. Remember to put a stamp (they will be brought to the post office) and take pics for the memories!
They also have an activity guide on the site, which has coloring pages in it. I like to do that with the boys on the same day.
To read more about Macy's Believe project visit the Believe site here.
Macy's has always believed in Santa and so they created the #SantaProject, a mission to keep the story of Santa alive in our modern age by filling the internet with the magic of belief. Go here and see how you can share socially in the #SantaProject.