DETONATE FIVE OIL BARRELS
Heading northeast of Kuwaq Yaku will bring you to a small jungle area where you can locate five red barrels. You'll have to run around a little to find them all, but it's no large feat by any means.
You can either start by heading right before entering the temple, or you can pass through the temple archway and head right to the Kuwaq Yaku Ruins Base Camp and start from there.
Either way, we have provided images to give you clues to their locations.