That was a bit more difficult than I had expected ...
I had to use the walkthrough twice. Once for the cryptic puzzle, because I couldn't figure out the movements of the triangle. And a second time because of the witness statements. I didn't realise that the game wanted me to interpret my findings already. I could kick myself for that, because it was clear that this was bound to happen at some point. I just expected it to be a later step. And I have to admit that working out the times was a bit too convoluted for me, so I just, ahem, "masterminded" it. :)
That being said: I love this game to bits. The graphics are good, the setting is great and the puzzles are genuinely challenging. Collecting all the witness statements in the diary was a lot of fun. I like mechanics like that. The hammocks were also a nice idea.
Excellent game.