"Zombieland was funny! But we only have a vague idea of what real zombies might be like. If their "fast" zombies I'll get a sailboat and sail to remote islands
If their slow zombies then I'll take chances and search for other survivors to travel with."

"Well, see, if you get a boat, do you know how to drive/sail one? If so, do you know where any islands are? Will they be habitable? Will people already be there? Will they be armed? Will they be infected?

Similarly, with the shamblers, where will you travel to? How will you sustain yourself? How will you deal with non-undead threats?

All of this you have to think about before you set off. If you wind up on a small island with a bunch of sprinting zombies, you're screwed."