Shantytown - Southwest Side - Climbing up from the Ground Level

After obtaining the GPS cache (7/15) and relic (5/7) in this area...

Climb the wooden ladder near the relic (or the stairs or the painted "scrambling" wall outside the relic room) to reach the second level of this structure.

Pry open the salvage trunk.

Then step outside and look to the northwest to spot another effigy (8/5) hanging on the cliff above. Burn it and pull it down. High above on the right side of the tower made of steel girders is a salvage net. Shoot it with a fire arrow as well.

Crack open the salvage crate where it lands. Then shoot out the nearby plank barrier to find another GPS cache (8/15) in the little alcove behind it.

Exit the alcove and go around to the right. Climb the wooden wall inside the metal tower to reach the next level.

Pick up the rifle/SMG ammo and open the food cache. Then move out onto the ledge overlooking the stagnant pool where you entered this part of Shantytown. Follow the ledge to the left and scramble up the painted wall to the next level.