You have to go to the far north gate once you enter Lakebed Temple, follow the path and then you'll have to battle some Tektites. Kill them then continue your way on the path/west. You'll soon see some water, dive down and then you'll appear on the other side, open the chest and then go back down underwater, and there's a yellow rupee in the chest, you'll soon see a rock, break it with a water bomb, then go through it.
!!!WATCH OUT!!!
There's two Barinades ready to sting you AS SOON as you get in there! Get past them then get out of the water on the lever in front of you, you'll see a circle, drop down and get the master key! Go back to the Central Room and unlock the door in the middle of the room! You will be battling
TWILIT AQUATIC MORPHEEL!
Notice how similar its name is to Ocarina of Time's Morpha. The strategy for the first part is exactly the same: take out your Clawshot, Z-target (or L-target if you're using Gamecube) its eyeball (it's running inside its tentacles), then draw it out of its tentacle and slash at it until it goes back in and repeat until you enter part 2.
Morpheel will reveal its true form, and you need to swim after it until you can use the clawshot to get onto its back (that's where the eyeball...thing... went. How it can see where it's going, I don't know. The Legend of Zelda has absolutely no sense of Logic whatsoever. It's still a good game though, don't get me wrong.) Once you see Link straddling Morpheel's back, you will hear epic music and now just start swinging the Wiimote like crazy (or for you Gamecube users, press B really quickly) until you get thrown off. Repeat until Morpheel is dead.
During the first part, don't stand too close to Morpheel's mouth. It will grab you with its tentacle and eat you, then spit you out. For the second part, don't swim in front of it's mouth or the same thing will happen.
Death Mountain
beat the boss
It's on the map.
the forest temple
get the boomerang.
The big key
You finish off the forest temple mini boss
After you complete the Forest Temple the twilight is no longer in that region and Link must travel to the next region of Hyrule to rid it of the twilight
as soon as you defeat the Minny Boss in the Forest Temple you get the boomerang
In Twilight Princess, the only monkey whose name is given is the forest temple boss monkey - his name is Ook.
collect all the monkeys then defeat the flower boss
In the sea temple.