Destruction. Lots of it. Burning, breaking, shattering, shooting, smashing, bashing, toppling, crashing, tossing, stomping... to name a few. I'd defecate wherever. Probably on a department store countertop. Then I'd look over at a mannequin, grab its clothes and wipe my ass while saying, "Don't mind if I do!" I'd then put the clothes back on the dummy and spend a good hour insulting it. "Look at you. You filthy piece of shit!" /spit
Like Chojin said, I'd try and procure a good amount of arms and munitions. Have to get some explosives somehow, too. Then I'd make my way to a large city. Probably Chicago. After that I'd get serious about securing as much non-perishable food as possible.
I'd spend a day hauling a toilet up a high rise (no electricity = no elevators) just to drop it from a height and on top of an expensive car. I'd probably take a shit in it before I dropped it... for my own ironic posterity.
I'd spend a day breaking into homes and plundering through belongings, because as sad as it sounds, I'd probably find it wildly amusing. Of course I'd be hoping to find something erotic. I'd spit wherever the fuck I wanted to spit, too. I'd light money on fire. I'd burn entire buildings just to watch them burn.
I'd spend a lot of my time watching television and playing video games, masturbating, bringing destruction, and reading books about Armageddon and survival. And I would totally make a badass garden. Something like this one:
http://www.botany.org/bsa/psb/2003/oriental_gardens.jpg
But most importantly, I wouldn't do a GD thing I didn't wanna' do.