The Five-Star Isles are little more than a collection of rock spires poking through the surface of the Great Sea. Several Kargorocs closely guard the spires, waiting to swoop down and attack unwary passersby.
Piece of Heart #6 (via Submarine)
Piece of Heart #6 is inside a submarine in this sector. Sail to the submarine, and notice a chest on a raft next to it. Open the chest for a Red Rupee, then swim onto the submarine and enter the doorway leading inside.
You face a few Bokoblins and Keese. Defeat the enemies, and a ladder drops from the ceiling of the submarine. Climb the ladder and open the chest above to claim Piece of Heart #6.
Sea Platform
Sail to the single Sea Platform and destroy all its cannons to reveal a chest on top of the platform. Climb the Sea Platform’s ladder and open the chest, which contains a minor reward.
Rings of Light
Three rings of light around this island appear only under the light of a full moon. Each contains a chest with a Red Rupee. When you see the rings of light, use the Grappling Hook to pull up the chests.
Piece of Heart #35 (via Treasure Chart #33)
Find and open Treasure Chart #33 (found at Windfall Island [D2]) to pull a chest from the Great Sea near the Five-Star Isles. The chest contains Piece of Heart #35.