Instructions
Go northeast from Hyrule Field to reach Zora's River. If you just learned Zelda's Lullaby and you are leaving Hyrule Castle, follow the stream next to the castle. It takes you directly to Zora's River.
Walk straight. Look for your owl ally to fly down to give you a hint about the area ahead. Listen to his hint and continue forward when he leaves.
Use bombs to blow up the boulders blocking your path. Press "Left," "Right" or "Down" on the "C" buttons to use the bombs. The button you press depends on the button to which you assigned the bombs.
Follow the path and climb up the ledges to get closer to the waterfall ahead of you.
Stand on the stone platform in front of the waterfall. Press the appropriate "C" button to take out the ocarina. Press "Left," "Up," "Right," "Left," "Up" and "Right" to play Zelda's Lullaby and access the door to Zora's Domain.