Goron City

Not to be mistaken for Goron Village of Majora's Mask, this is the home of the Gorons of Ocarina of Time, and is located mid-way up Death Mountain. The city has lots of floor and it's almost completely made of solid rock. In this city, there is a passage into the Lost Woods, which Link must use to get to the Sacred Forest Meadow to learn Saria's Song. Then, so you can enter Darunia's sanctuary, you must play Zelda's Lullaby,and then, to cheer up Darunia, Link must play Saria's Song. By doing this, Link can get the Goron Bracelet, which he can use to pick up Bomb Flowers.

Heart Pieces
A Goron outside Darunia's Sanctuary asks you to bring fire from his sanctuary. To do this, you need to get out a Deku Stick, light it on one of the torches, and light all of the torches on the same floor as the sanctuary, which will cause the giant urn in the middle to start spinning. Notice that it has three faces, happy, normal and angry. Then, after you get the Bombs, come back and throw one into the giant urn. If it blows up with a "Smiley face" facing the camera, a heart piece will pop out.

Trivia

 * The platform where the lone Goron sits, in the air suspended by ropes, was where the Goron's Ruby was once displayed.