No decorations on or near the chimney or fireplace. Chimney flare ups and embers can easily set decorations on fire.
Do not chain more that 3 light strands together. Daisy chaining lights or surge protectors can be very dangerous and lead to fires.
Use outdoor cables and GFCI outlets. Inspect your cables for fraying and that they are usable outdoors. GFCI outlets are labeled and required for anything plugged into a we environment to prevent shorts.
Anchor down your inflatables. We can get a lot of wind in the Gulf Coast, make sure your inflatables do not go for a ride with Santa.