You're missing something.........oh, a medic. And the occasional trip back towards mainland for target practice and ammo, basic supplies and whatnot. I know of a few places to raid after the apocalypse. I doubt this island will have a steady meat source, and zombies being the mindless undead they will be, they won't be fast or smart enough to catch wildlife, also assuming the disease that causes the zombie apocalypse isn't an airborne disease. Me personally, I'd head for the mtns here instate or make the trip back to CO and stay there way back in the mtns, outside of a smallish town, less zombies to worry about/kill.