well, 1. if the walking dead were outside, the best option would be to wait it out. Seeing as they're dead and rotting, soon enough the bacteria that exist inside everyone would be slowly eating away at their insides. Before too long (some places sooner than others) they would simply continue to decompose until they are rendered incapable of harming anyone. In many cases the buildup of methane gas (released by the bacteria) would cause the zombies to explode like an undead balloon.
I'd want to stay alive just to see that.
I'd want to stay alive just to see that.