Woman on an island, day 23

After a glorious feast last night of roasted chicken (I'm calling the flightless bird that for the meantime) and scrambled eggs, I tried to catch some rest on the bed in the house but it felt wrong in some ways. I spent the night sleeping on the floor eventually. I pack up to head home, this has been a very successful and interesting trip to say the least. What a strange place to build a house, it's in the middle of nowhere. I see a little fountain just a short distance away, At least they have running water, Something starts to nag at the back of my mind...fountain...eye...of the fountain...the note! I hastily pull out the tattered piece of paper-  "The eye is the key". Can it be? surely not. I walk over to the fountain to have a look...seems normal...I lean on a small rock to think and suddenly it starts to move! It's hollow inside! There's a keypad here! Now what could the code be? (help me here readers!)