I'm sure that your familiar with this zone as well, because Dark Valley was also featured in "Shadow of Chernobyl". Thankfully, it's much easier to survive here right now than the last time you were here. The main reason is that most of the area is under Freedom's control. You must, however, watch out for radiated zones. There are plenty of them here.
1) Exit to: The Dalley (exits from the main base)
2) Guide - The Dark Valley: Main base
3) Exit to: Cordon
4) Exit to: Garbage