Controlling the owl statues
At one point you have to move all the statues of owls somewhere. When you move an owl statue to where its supposed to be, you get a letter. After you get the letter, look around and you might see a treasure box. (optional if you want to get the treasure box). If there is a gap between you and the treadure box, move the owl into the gap. Then you can jump across and get the treasure box.