That thumbnail looks like the undead offspring of Hitler and Jeff the Killer.
Map's done and I've thrown some other suggestions into the mix. Pay absolutely no attention whatsoever to the lack of effort I put into those icons over there.
Key:
Spots with faded outlines - Places things spawn. The bigger the spot, the more characters spawn.
Spots without faded outlines - Possible spots for clique leaders to spawn
Numbered purple spots - See Purple Spot Notes below.
Very small black dots - Places where some supplies can be raided, I guess.
Spot Colour key:
Blue: Jocks
Brown: Greasers
Cyan: Preppies
Green: Nerds
Orange: Townies
Red: Zombies (The places they would gather at the most, but would still appear everywhere.)
Yellow: Generic survivors, or somebody/a group from a random faction
White: Bullies
Purple spot notes:
Zombie freakshow exhibits (at least the ones that function correctly in free roam) could spawn here
Pirate Vance fighting a zombie or two for the hell of it.
Sledgehammer Norton
The Jocks can store the vehicles they've stolen here
The Go-cart is here, provided getting it passed the school bus isn't a problem.
Misc. Notes about certain spots/Suggestions:
Earnest would be found in the observatory along with a random Jock, where he would be forced to work and make weapons for them. Of course you could knock out the Jock and take some of the weapons, though.
The comic book shop would be locked at all times, however the basement extrance would still be open and there would even be a few nerds inside (And Earnest if he's not the Jocks' prisoner)
The other nerd spot is a bit far-fetched and probably a bad idea, but it would be funny to see some of the nerds in that awkward collectible spot on that one roof.
Johnny would be riding the fastest bike available, and it would be yours to keep if you stole it from him.
The Jocks at the school gates would laugh at and taunt you during the day.
