A roaring fire and custom lights for sure!
So fascinating just to stare at a fire for minutes at a time. Like an instant meditation.
Also, I remember another one-- cats and the Christmas tree. Because every year, they were delighted to see us set up an elaborate new cat bed for them, and would quickly settle in. Fortunately, neither of them were climbers, which looks to me like a great way to ruin various things, or even to start a house fire.