I noticed that the painting on the cave wall shows villagers falling down a waterfall and the clues hint about some villagers going to another part of the island. Does the trench on the left side of the screen have anything to do with this? It looks like the dark patch in the water on the left side of the lagoon (under the first flower on the left from the top of the screen) could lead to the trench. The map shows more island that we do not currently use and it looks like someone is standing in the middle of it (maybe the blinking eyes?). I'm on an old IBM laptop and my graphic card isn't the greatest so I might be seeing things. LOL