All you boat thieves: take me with you! I've got plenty of open-ocean navigation experience, and I figure we can make for Prudhoe Bay or somewhere thereabouts in Alaska/Canada where it's frozen for ten or eleven months a year. That way the zombie hoarde will never get to us, or if they do, we'll only have a month or two of zombie fighting out of the year. Keep it on the DL, though, or we'll find that our arctic paradise is overrun with numbskulls, who probably brought the virus with them. We can hole up there during the summer months, and when the winter freeze comes to the lower 48, we'll go on re-supply expeditions to overrun military bases looking for replacement gear and MRE's. Piece of cake, and once we shove off from Oahu, we'll probably never have to shoot another zombie again, just knock the heads off frozen ones!
As far as weapons go, I'd take the shotty, because I want to cause serious zombie face trauma, while shooting on the move, and I don't care about long-range engagement. Plus weight of ammo isn't really a concern, since once I make it to the marina, I'm golden.