Review house and landscape with a critical eye
Repair problems
Clean up yard – prune bushes, weed, and pick up twigs
Unclutter all rooms; if time allows, clean up closets
Buy new doormats
Have gutters and windows cleaned
Have rugs cleaned
Make sure all doorways are swept and free of cobwebs and debris
Wash front door; repaint if necessary
Put out urn/basket of fresh flowers/plant at doorway
Remove family photographs
Pressure wash patio/driveway
Have copies of prior years property taxes paid
Have copies of utilities paid
Put out fresh flowers/plants in a few rooms
Bake cookies the morning of the Open House

For yourself:
Keep copies of all home improvement bills to establish cost basis of house

• Need this info to calculate any capital gains