The best way to spread Christmas cheer is singing loud for all to hear.
I come from a family of singers. Every year at Christmastime my family carols to friends, neighbors, and those in need as we deliver gifts. It usually takes several nights, but we have a blast. All parts are sung in our (originally 6, now 8-person) a cappella choir. It's one of my very favorite Christmas traditions.
Have a very Merry Christmas!