Once I've read the safest place to be during a zombie apocalypse is an offshore platform. Unless zombies recently learned to swim, this could be an interesting option. I believe the PZ map contains a dock. Dock means sea. I don't expect to be any islands out there, at least not right now. But imagine if we could build drafts (out of planks, nails, ropes, sticks and tarp), then we could put ourselves to safety for good (while still having to go back to the land every now and then).