Dungeon 7

 Dungeon 7 is the largest in the entire game, so take a deep breath. The first thing you should do is head into the room on the right and pick up this Key.
Go back left, then up, then right until you reach the Compass. Get it as well.
Go left until you reach this room. Now head downward.
Follow the path that the staircase takes you through and you'll eventually reach this Patra. It's two big Patras circling eachother! This is a much tougher fight than the last Patra was, but if you have high health, you should be fine. You can and should bomb the left wall and go that direction after defeating the Patra.
More Rupees! At this point in the game, just start thinking of all these Rupees as extra Bow & Arrow ammunition.
An odd place for a Fairy, but a welcome sight nonetheless.
In the third Rupee room, you can bomb the right wall and head that direction.
You'll pick up a Key for your trouble. Kill off the Keese and go to the right.
It's one of those block pushing rooms... Going down will just lead you back to the room you fought the Patra at, so go up instead.
Follow the path until you reach this room. Bomb the lower wall and head down the staircase you find in the next room.
The Red Candle will replace the Blue Candle. It's basically the same thing, but can be used infinite times per screen.
Make your way back to the screen shown in the third picture here, and keep going left. Pick up the Key here and head north.
Instead of fighting these Blue Darknuts, bomb the right wall and head that direction.
More Rupees... Sheesh what're ya gonna do with all these things?
The next room has more Rupees and a Key. Pick up the Key. The room above this one has Rupees too if you like lots of ammo.
Go back to this room, that's above the dungeon's entrance. Cross over the lava river and go up.
Keep going up until you reach this room. You can bomb the left wall, but you'll want to go to the room above this one first.
Finally, there's the Map. The bad part is that you'll have to fight some Blue Darknuts to get out. Just be thankful that's a Blue Bubble and not a Red Bubble.
Now you may go through the aforementioned bomb-revealed door. You can go up here to talk to the Old Man, then continue to the left.
In the room above this one is another Fairy Pond that you should visit if you're running low on life. If not, just grab the Key and head down.
When you reach this room, pushing the block not only opens the doors, but also reveals this staircase. DON'T TAKE THE STAIRCASE. It'll just take you back near the entrance of the Dungeon.
Keep going until you meet another Manhandla. Bomb it out of its misery and head down this staircase.
You'll be led to another Aquamentus, but this one is more powerful and has 3 times the HP. But since you're so much more powerful too, you should have no problem. Just slash away.
Just one more to go!