What Exactly Can You Do Post-Game?
I'm currently playing Far Cry 3 and Halo 4 (alternating between the two) and having a blast. However, I'm still rather early into the former, having just started the mission where you're supposed to break into that one prison.
Anywise, I recall reading the game has post-game play, and I was wondering: what kind of post-game play is there? More specifically, what does it allow me to do? If I want to collect, say, the rest of the relics, can I postpone that until I've finished the main story? Are there quests/achievements/things that have to be completed before the main storyline ends? How open-ended is the experience then?
I'd like a clear answer to what I imagine is a simple question to those of you who have already beaten the game.