Food, stuff to use as weapons. Probably generators and fuel Plenty of space around it Security fences on everything
Day of the dead got it right.
Except everyone else will have the same idea and Zombies will be more likely to wander into your location due to being in city limits.
A Zombie will not stray far from where it was originally reanimated due to having severe bone and muscular decay and no complex thinking capabilities as it would be surviving off of primitive instincts. So the safest place would be the Wildnerness away from any form of civilization.