Reach the chopper
Once you are dumped into water, keep pressing jump, in order to set yourself free. Resurface now, and swim towards the waterfall. Right at the other side, there is a pirate, that you need to kill quietly, and collect his weapon. A bit further, there are two enemies, who also need to be taken out quietly, and their weapon collected.
Walk over to the right and climb the slope. This place is an excellent vantage point overlooking the village. Jump down to the right into the plants. Make sure that you are not spotted/heard by the guard patrolling the area (marked with a skull in the screenshot). Wait for the enemy, marked in the screenshot, to go past you and take him out when you are not seen.
Remain in the bushes and go right, towards the sniper. Wait for the right moment to kill him and collect his weapon.
Opposite this building, there is an alarm trigger that is best neutralized.
Cross the river. You will notice the chopper guarded by snipers and an armored enemy. I recommend that you ignore the enemies and run headlong to the chopper. If you manage to reach close enough, the mission will be accomplished.
Press, and hold, the correct keys to get out of the pauper's grave. Go towards the marked village. Walk over to its right side and hide in plants. Lure one of the enemies towards you, by tossing a stone, and kill him when he comes close enough. Work the same trick with the other pirate. Enter the house shown in the screenshot (behind the enemy) and collect the flak jacket, and mines.
Enter the village and go to the house shown in the screenshot. Do not worry about the civilian to the right. Once inside, collect a first-aid kit and a C4 explosive. Kill the remaining enemies in this part of the village, without causing alarm.
Go now to the north-western part of the village, where there is an armored enemy standing in front of a house, and dogs. Walk around the house keeping a safe distance and get at its back. That's where you will find a ladder onto the building's roof.
Once on the rooftop, toss a stone to make the enemy take a few steps forward . Toss a C4 explosive to his feet and detonate it. If you are lucky enough, the explosion will also kill all of the dogs. Otherwise, try and kill them with mines. Enter the house to find your equipment whole in the locker.