If your locale gets freezing-or-below temperatures, shut off water to outdoor spigots to avoid frozen water pipes.
The change to lower humidity may lead to squeaky doors. Lubricate hinges on every door from full-size to cabinet.
Hold another family fire drill (see May).
Drain the gasoline from the lawn mower and other power tools. Be sure to store tools in the garage, not your house.
One more time, clean those gutters.