Its winding cliff sides and many dead ends can get very frustrating at times and the higher up you go the higher chance you have of falling to your death. The Sorrows are a very peaceful tribe and shouldn't attack unless provoked.
If you go through Half Mouse Cave and exit through the back, you will enter the higher part of The Narrows that contains a few beds, some minor loot (that must be stolen), and three surprisingly harmless geckos. These geckos will not harm you unless provoked. Then you can continue up a ramp and along a bunch of cliff sides all along the Narrows which is a good way to get around (just be careful not to fall off, chances of you surviving are very slim for some spots).
The three geckos will not harm you unless provoked, but killing one might not alert the others. If they do turn hostile, the Tribes men will aid you in combat and you will earn 25 XP (unless you have a perk that grants you more) for each kill, equaling 75 free XP all together.