Skill tree - outpost help please?

From my experience of liberating all the outposts in the game, I can say there isn't really any easy one on the second island. However, I did manage to go undetected on a few by using a suppressed Z93 rifle in combination with the Bushmaster signature weapon. Mark everyone before you attempt to liberate the camp and don't do a knife takedown unless you're sure it'll go un-noticed. Good luck :)

OK i made few trail-and error and came up with this:
undetected is to never make "their "spotmeters" filled"(shaboo_de,2012) and that inclued any pirate right next to the camp (i once got spotted by a patrol),
so here is another way to do it.
reach the second island and get the privateer outfit and then no one will suspect you on site, you can stay by the border of the camp and spot the guards,
kill them one by one, and escape outside the border if necessarily
however 1 thing to know is that once a dead body has been discovered then you will be suspected even outside the border(watch-out from patrol) so stay hidden.

another way is to free caged animal and hide hopefully he will liberate the camp(clean up stealthy after him if he dies).