Left 4 Dead: Hike'n'Hunt

hunting in the wilderness, you arrive to a nice little valley with a small pond in the middle. You extract your campaign equipment and set up fire. You suddenly hear a distant scream, everyone wakes up and meets at the camp fire - one is missing.. You use your cellphone to call for the forest guard, but in the instant moment, zombie hordes start to roam in, you grab your rifles and defend yourselves - you say to yourself quietly, I should had stayed home...
This map is located in the wilderness, and has various camp spots, and recommended not to be too easy. Zombies coming from every angle. :D [*] [b]Story[/b] You and your friends are hiking and