A message in a bottle can be found in the Spirit Realm of Aminishi. Access to the Spirit Realm is obtained during the Spiritual Enlightenment miniquest and requires spirit dragon charms to access and remain in the Realm. The bottle is located on the beach below where the Aminishi moai was before the Head of the Family miniquest. In order to see the message in the bottle, the player must talk to all crew members, including Flippers McGraw. It can be investigated to receive a treasure map.