2.Use the surrounding foliage (trees, grass, etc.) as cover. Remember the thicker the better.
3.With all these steps in mind, plus camos, the enemy should just stroll right past you.
(HINT: These tips work better with online play. The single player enemy AI is smarter than an actual human.)
P.S. Throw a flash bang or a smoker in the window first.
P.P.S. When more enemies come after the final hut throw frags way out behind the hut while you're still on it, then kill anyone who charges, then crouch and move silently around the perimeter of the back of the island and kill the surviving snipers.