http://www.allthingszombie.com/phpBB...forum.php?f=30
Entire part of a message board devoted to this discussion, LOT of people with a LOT of time on their hands there.
Anyways, the island scenario is the the best, as it eliminates the Zombie threat, but what is actually the bigger threat is raiding parties of survivors that just go around and take your women and your food. Again an island makes that less of a threat, the farther it is from society, or the more well hidden and defended it is. Ideally its an island with a hill that has an easily concelaed cave. Preferably in a warmer but still temperate zone (Zombie freezing helps, its easy to crush skulls when the zombies are not trying to eat you.) With areas around it that you can hunt and forage for food, and later farm, after the raiding parties have died out.