Crescent Moon Island gets its name from its shape. It’s a small island with just a few things to see and do. Use the Boomerang to smash the pots that float on top of barrels around the island and score some Rupees.
Blue ChuChus
Defeat the two Blue ChuChus near the treasure chest for a couple of Blue Chu Jellies.
Treasure Chart #10
Open the treasure chest that’s sitting on top of the island to find Treasure Chart #10.
Treasure Chart #9 (via Submarine #2)
Treasure Chart #9 is located in a submarine. Old Man Ho-Ho is looking at the submarine from the island, using his telescope. Sail to the submarine, climb onto it, and enter the doorway leading inside.
Inside the sub, you must defeat four waves of Miniblins. Four torches light in turn as you defeat each wave of Miniblins. Once all four torches are lit, a ladder drops from the ceiling. Climb the ladder and open the chest you discover above to claim Treasure Chart #9.
Piece of Heart #12 (via Treasure Chart #11)
Find and open Treasure Chart #11 (inside the Dragon Roost Cavern dungeon at Dragon Roost Island [F2]) to pull a chest from the Great Sea near Crescent Moon Island. The chest contains Piece of Heart #12.