Your destination is the Eastern Communications Post to the North-East of the landing site. Before you go there, you may want to take a look at two other things. If, during your explorations, you have not yet found a puppy (D-Dog), he should now be around the landing site. Approach the dog and fulton him (send to the Mother Base on the balloon), thanks to which you will soon get a new Buddy.
The other important issue is the option to recruit a Russian interpreter. IF you still have not done the side mission (Side-Op) connected with him, you can find him in outpost 24 that you pass by on your way to the enemy base. Identify him with the binoculars - he has been shown in the above screenshot - and you can recognize him by the green beret. You can deal with the guards of the interpreter straight away, or wait for him to enter the building. Either way, try to restrain him (he does not want to cooperate) and fulton him, thanks to which you will be able to interrogate opponents, starting with the next mission.
The easiest way to get to the base is along the road, but you need to watch out for the truck traveling around the map and for, at least, one enemy patrol. I recommend that you reach the destination from the south, along the narrow path between rocks. Watch out for wolves here, that it would be better to put to sleep and fulton. Examine this place, because on the rocks marked in the above screenshot (you first need to climb onto them), you find a Rough Diamond. Collecting it completes one of the hidden objectives of the mission. Apart from that, thanks to following the path among rocks, you get to an excellent viewpoint.