Can anyone tell me where the entrance to lab is? I've gone to the marker and all around it and I'm stumped. Marker just leads to cliff which there doesn't seem to be a way of getting up on.

Near the marker there's an entrance to a cave, it may be hidden by a bit of foliage.

Hm I still can't find it for the life of me. The path that I'm on is a hill and two campfires going along the side of it and on other side where marker is there's just cliff and i've been running along that with no success.

Hmm, think if you're on the hill with campfires, you've gone too far. It's up a slight slope and I think there's a dead body opposite the entrance to the cave. Could be that you're actually directly above the cave where you are.

wow.... i actually looted that corpse missed the cave. thank you

lol, how anoying. Had a couple of moments like that myself; just as well the scenery is so pretty.