Well, I would go down south to save a few friends who might be in trouble. But Ill say that I have a few hours to race there and race back, giving me half the time. That's fine.
First, smash the stairs. Put a step up with a rope so I can jump upstairs and pull the step up behind me the moment the zombies come.
Second, grab a spare wooden door, place it at the top of the stairs. Put nails, hammer and vegetable oil next to it, so I can seal the top of the stairs off further. Vegetable oil further inhibits climbing.
Stop up the tub and sink, and turn the water on. This will give me many many dozens of gallons of drinkable water.
Put a board next to the door to the basement. That would be a somewhat decent place to board up, and contingency plans are ALWAYS good.
Throw a bunch of stuff upstairs. First, food that can be eaten as is. Limit perishables to stuff that can be eaten before they go bad. Second, grab the flour, and make about 10 pounds of hard tack. Since I'm completely set on food at this point, grab some Nutella to make the hard tack at least palatable. Next, any supplies that might be helpful, first aid, rope, weapons from the shed, stuff to fix the barricade, etc and throw them upstairs. Lastly, grab computers and TV for the sake of avoiding damages, the board and role playing game supplies, and the few books that are downstairs. Morale still counts for something, and throwing it all upstairs will take a few minutes tops. Make sure all chargeable devices are charging, not to mention all batteries are available.
Next, re-enforce to the best of my abilities. First, close doors, pull shades, turn off lights, and block windows, so even though a determined zombie will get in the bottom floor, it will likely be too much trouble to do so if we don't make ourselves known. Next, board up all the upstairs windows. Though it would require a climbing, nimble zombie, it's worth it to be on the safe side. Next, make sure that all the doors can be quickly shut and locked secure by an intelligent person on either side, so unforeseen invasions can be sealed off. Lastly, make sure that access to the roof is locked, but easily opened and then locked by an intelligent person on either side, just in case things REALLY go wrong, and the roof is the last ditch hope. Throw some Saran Wrap, a few pots, (Solar Still) an extra blanket, and a tarp up there, so we can set up a distress signal in the tarp and camp on the roof if the whole house is compromised.
Lastly, make a zombie pack. Have a pack with a few necessities, like some hard tack, spare knife, matches, rope, and so on, so if I have to run, I have the bare essentials. Grab my crowbar, nail up the door, assign a friend to watch for trouble, and sit down in the center room, and play a hell of a lot of Magic, Settlers, Risk and D+D, listen to my MP3 player with Ear Buds (Checking the radio every now and again), catch up on my reading. Could actually be a pretty good week.