Good question. I'd prolly just try to find a small island somewhere. But, remember. There are other millions of other people trying to do the same thing too. Going north to ice doesn't make much sense anymore.
And I still think L4D sucks. It's just a badly done, highly repetitive Half Life mod. A bunch of community modders could have made the same thing for half the budget.
If I was at school, I'll feed them on my teacher while I run.
If I was at soccer, I'll powershot some balls at their heads, HEADSHOT.
If I was at tennis, I'll go melee and whack them with my racket.
If I was at home, I'll do the typical fortify place, steal a shotgun from the gun shop nearby and steal some computer parts if I can