Where is the dragon, and how do I get the mirror

Hint 1 of 9:

Did you find the dagger under the rock?

Hint 2 of 9:

It is just west of the castle moat.  Push the rock to uncover the hole.

Hint 3 of 9:

Well, how deeply have you thought about this?

Hint 4 of 9:

Cut the bucket free from the well.

Hint 5 of 9:

Lower the rope, and then climb down the rope.

Hint 6 of 9:

Type DIVE to go underwater.

Hint 7 of 9:

Quickly swim throught the little hole to the west.

Hint 8 of 9:

Save the water until the dragon is very close to you, then throw it.