Inside, look around you.  Are the rugs worn?  Is the paint fading or chipped?  Spruce up the interior where you can.  You can hang up new towels in the bedroom, replace the rugs, clean the carpet, touch up the paint.  You do not have to spend an arm and a leg, remember.  You just have to put a shiny veneer over everything.

Outside, make sure the lawn is mowed at the very least.  If you have landscaping, making sure it looks top notch.  Trim the hedges, water the garden, maybe try to fix craters or cracks in the driveway and the sidewalk.