-Reach the hunting ground
-Kill and skin 2 boars, then collect the 3 types of plants in the hunting ground
-Fast travel to Amanaki and meet with Dennis
-Talk to Dennis
-Use the crafting menu to craft some medicine syringes
-Craft a Simple Loot Rucksack
-Get in the truck
The hunting grounds are just southeast of your location. Fortunately there's a vehicle nearby, as indicated by the jeep icon on your mini-map. Run to toward the car and enter through the driver's seat. Instructions on how to operate the vehicle will appear, and you're set. Drive down the road, take a left at the crossroads, and continue to follow the road until you reach a wooden bridge. So you may want to get out and walk from here, as most esteemed hunters don't run their prey down with their cars. Head east until you reach the hunting ground, indicated by the yellow marker on your mini-map.
You must collect the following for this mission:
-Red leaf: 1
-Green leaf: 2
-Blue leaf: 1
-Boar skins: 2
The leaves are marked for you on the mini-map. Acquire the leaves first, as they can be found outside the hunting ground. In order to acquire the boar skins, kill a boar, then approach its body. An option to skin it should be available. Be warned, the boars will run away from you once they hear the gunshot. If you run out of bullets before killing the two needed boars, there are several chests located nearby with ammunition in them. These are indicated on your mini-map by diamonds.
The blue leaves can be found just east of the hunting ground in the river. After you've gathered all the required leaves and boar skins, fast travel to Amanaki and meet with Dennis by accessing your world map. Speak to Dennis once you arrive. Dennis will instruct you to craft some syringes. Do this by accessing the crafting section in the main menu and selecting "Medicine".
Once you've finished crafting the medicine, you will be told to craft a Simple Loot Rucksack. This is one tab over from the medicine. Once you've done this, you will be brought to a screen which displays your three skill trees. You should have about 2 skill points to spend. You will have to visit the middle tree titled "The Shark", and spend a skill point in a skill titled "Takedown". This skill will allow you to silently dispatch enemies, thus receiving x3 XP per kill. In order to silently kill enemies, you will have to approach them from behind without being detected. You may spend your second point as you wish.
After you've spent your second point, if you had two, speak with Dennis. After you've spoken with Dennis, get into the passenger seat of the truck he is driving. Dennis will drive the two of you down the road for awhile, until you reach an outpost and your mission ends.