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Chapter 6, near the end of the resort. You row a swan boat across the lake to the island.
Once you are on open water, paddle on one side only, L2 or R2, and keep the boat turning in one direction. It can take a second full turn before it unlocks. Alfred rows slowly.
If you reach the island without it, replay chapter 6 from Chapter Select.
Photos
The dock where you board the swan boatTurning on open water
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Gold trophy