The Legend of Zelda: Majora's Mask/Northern Peak

After finishing the woodland temple, you need to head to the mountains to the north. You can't use a bridge to the mountains, you instead need to travel by foot. The slope to the mountains starts to the left of the center location.

However, it is blocked by ice. To break the barrier, take your bow and shoot down the icicle above. Another barrier of snow balls is located further up, and they can be blasted away.

Proceed behind the smithy to reach the Goron village. Head to the owl and talk to him.

Jump from feather to feather, and retrieve the Lens of Truth from the shrine.

Return, and speak to the invisible Goron. Follow him back to the smithy, and head to the watery area. Use the lens of truth to head up the cliff (look at the route first), and climb.

When you enter the hero's grave, use the lens of truth to speak with him. Play the Song of Healing on the Ocarina to obtain the Goron Mask. Pull the grave back to open the hot water spring, and unfreeze the Goron just outside. Also, be sure to smash one of the boulders in the valley before the Goron village, unfreeze the elder, and speak to him as a Goron. You iwll learn the Lullaby Intro.

Head to the goron village, and punch the rolling boulder. Ask to open the shrine, and quickly head there before the door closes. Play the lullaby intro infront of the baby, and she will teach you the rest of the song.

Places of interest

 * The smithy can improve the strength of the sword once you pour hot water on the smithy's hearth. The bonus only applies for 100 attacks, but can be made permanent using gold dust.
 * A deku scrub in the Goron village will sell you a Bigger Bomb Bag for 200 rupees. You need the Big Bomb Bag to purchase it.