You need to use your cannon (bombd when activated on ship) and blow down the door. Destroying the cannons situated outside will be useful (so you won't get hurt while trying to destroy the door)
Once you have gone to the forsaken fortress the second time it should be marked on your sea chart
Zelda isn't in the forsaken fortress, if your talking about Aryll (Link's sister) you free her later in the game
When go to Forsaken Fortress for the second time to save your sister, you have to fight Phantom Ganon, and once you kill him you get the hammer.
You get the skull crusher hammer when you beat phantom ganon at the forsaken fortress
The Bokoblins in Zelda: The Wind Walker have their habitat in the Forsaken Fortress. However, they can go anywhere.
No just steal them from the enemies in the forsaken fortress its easier to get them by using the grappling hook.
On the Sea Chart, it's five squares down from the Forsaken Fortress.
it is south east of forsaken fortress. However, you will need the ballad of gales to get inside the island.
You can get ice arrows after you beat The Forsaken Fortress for the second time. Then, you will have to use the Ballad of Gales to warp inside Mother and Child Isles to get the fire and ice arrows.
Make the wind direction towards the isle closer to the Forsaken Fortress and fly over there. Then change the wind towards the Forsaken Fortress wait till the cyclone (or tornado) comes close and fly over it using the Deku leaf. It should make you go higher so you can get on the platform. ------------------------------------------------------------------------------------------------------------ Erm, the person above doesn't know what he or she is talking about. If they actually played the game, they would know that they are referring to the FORBIDDEN WOODS, not the FORSAKEN FORTRESS. Anyway, you don't get Zelda at the Forsaken Fortress; you get Aryll. And to do this, you have to reach the top of the tower.
She goes to the same place as Link's sister, the Forsaken Fortress. Once you get her back she becomes rich and as snobby as the rich girl.
You get both fire and ice arrows from the Queen fairy at mother and child isle. You must warp to the island by playing the ballad of gales on the wind waker. The fairy will only give you the arrows AFTER you've rescued Aryll from the forsaken fortress.