Also, could you be a little more specific on number 4?
EDIT: Never mind.
English
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Okay, keep riding the water line, do not stop at all till you reach almost the end of the river youll soon see metal spikes or structures popping out of the water and behind you should be past all shipwrecks. Keep going and sometimes the game will till you to go back in 10 seconds keep going and soon you'll see a golden little chest in the hill side to your left.