Ohhh!!! Do what a city in Fallout did, just get a Cruise Ship anchored or stranded somewhere a little under a mile from the shore! It'd be perfectly safe so long as all the people who die aboard are quickly taken off.
It'd def need a lot of preactions made, like escape routes should the worst happen (always think one step ahead!). The trickiest part would making an area secure so that you can lock yourself in, but get out quickly should you get trapped with a zombie and everyone would be required to keep a weapon on person which in itself poses its own risks.
And yes, Saranda, let's hope for your sake you aren't in your apartment when it goes down. EVERY apartment in a zombie game is overrun, those things are death traps!