King Kong: On The Raft

Following with the river's current and approach first rocks. Be careful, because you and your comrades will be attack there by some worms. Kill them with sniper, but do not waste too much ammo.

Head to wooden construction, where natives will be standing. Eliminate them by destroying catwalks (save ammunition for later). To do that, take the bone, fire it up from the spear and throw in the shrubbery's direction, which grows under palings maintaining the construction. The fire will break them down.

River is turning and you'll run into next bridge located in front of you. Try to destroy it from safe distance, because natives will attack you with spears.

After that, swim between roots of trees. It's risky moment - some flying monsters and worms will attack you. Shoot fast to eliminate them.

Now, you'll enter next section of the river. You'll be carried quite fast by the current, from one side to another, but no enemies will show up, so don't worry about your life.