Things You'll Need
Instructions
Go to the second stone head, if you're not there already. This stone head is due south of the temple on your map. If you're returning, be careful since two Zora warriors may jump out of the water again to attack you near the head.
Walk to the left toward a small ledge between a wall and a stand of trees.
Jump off of the ledge, and walk up the nearby stairs.
Follow the left edge of the raised area you're on until you see the third stone head in the bottom-left corner of your screen.
Equip your boomerang from the "items" menu.
Throw the boomerang across the gap to the statue. When it strikes the statue, it will activate and fire the final laser at the temple, opening the door.