The Legend of Zelda: Oracle of Seasons/Mount Cucco and Dancing Dragon Dungeon

Before the next quest
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Holodrum
With the Bright Sun retrieved, you'll be warped out as usual and receive another message from the Maku Tree. The Bright Sun has strengthened him, and he has seen that the powers of darkness still grow somehow.

He has also dreamt of the waterfall on the mountain north of Sunken City. The next esscence could be there, but what does the waterfall hide...?

Natzu (Summerland)
"Natzu" is Japanese for "Summer".

This area is different depending on which animal companion befriended Link.

Sunken City
Items that can be collected:
 * Gale seeds
 * Flippers
 * Gasha seed (treasure chest)
 * trade Goron Vase (see below) for a fish
 * trade mushroom (see below) for a wooden bird

Moblin's Keep
Use the flippers to access the Great Moblin's Keep from the south-west.

If you defeat the Great Moblin, you can get a Piece of Heart from a chest in the ruined keep.

Goron Mountain
Items that can be collected:
 * Ring box upgrade
 * trade Lava Soup for Goron Vase

Mt. Cucco
Access Subrosia from a portal on Mt. Cucco.

Treasure Grove
The Strange Brothers steal Link's feather, and he has to chase them through their treasure grove in order to get it back.

Spring Tower
After Link got his feather back, he can access a cave near the Treasure Grove that leads to the Spring Tower.

Springtime on Mt. Cucco
Items that can be collected:
 * Piece of Heart
 * trade Megaphone for a mushroom
 * ring
 * Dragon key (actually on the east side of Goron Mountain)

DUNGEON: Dancing Dragon Dungeon
Dancing Dragon Dungeon is a dragon-shaped mine shaft of doom. You'll find the treasures in here have been heavily guarded with monsters and danger to discourage adventurers.

However, the next essence resides in here, and the only way to find it is to face the challenges this trouble-filled dragon holds.

Waterlogged and danger-ridden
The first room, as are many others here, is flooded with water. There is a locked door to the right, so swim over to the left to enter the next room.

This room has a chest you can easily reach: simply push the block two spaces left from it down. You'll find 10 Bombs.

With those extra bombs, ignore the Shrouded Stalfos and hop in the mine cart.

As you ride the mine cart, you'll pass a switch. Don't hit it until you round the curve. You'll switch the tracks, but still head north.

Once again, ignore the enemies and go east to spot a cracked wall. Plant a bomb right by it and head into the uncovered room.

Eight switches, nine pots, and one small key
Here is a simple puzzle: activate all the switches at once. However, there are 8 switches and 9 pots to use. Two aren't needed, but to make things easy, follow this solution:

You'll earn a Small Key as a reward. Now, take it and unlock the door in the first room.