Far Cry 3's campaign starts with you being teased and held captive in a cage by Vaas with your brother Grant. After a daring escape, Grant gets killed and Vaas chases you away, leaving you to fend for yourself.
From here, the campaign sees you attempt to rescue the rest of your friends from the pirates with the help of the local tribal people, the Rakyat.
They teach you that in order to survive and free your friends, you must learn the ways of the jungle. Part of this process involves getting tataus (tattoos) which is a new and novel method of representing a character's skills and rank.
As with previous instalments of the series, the island is littered with outposts which can be liberated to provide you with safe houses, fast travel points and gun vendors.
The number of outposts in the game is pretty much spot on. There's roughly two per "section" of the map and that's more than enough to keep you occupied without becoming bored.
There are also multiple rewards for clearing an outpost of enemies. Getting caught and allowing the pirates to sound an alarm will net you 500xp plus several waves of re-enforcements, getting caught but without an alarm being sounded will grant you 550xp and finally purging an outpost without being detected at all will give you a lovely 1500xp - well worth it.