well r u talking about the 1st time u go around? ok then go around and defeat the monsters running the 3 searchlights. then u need to go through a door and inside will be 2 moblins u need to get past. hide in a barrel and carefully work your way past them. be careful of rats too they can bump u out of your barrel. then when u go out a large wooden door. u need to go up 2 or 3 flights of stairs and work your way past another moblin. hide in the barrel and run around the corner once the monster turns away into another corner. when u r way over past a far corner sidle along a ledge with two health hearts on it. the go up the stairs and u will find your sword. use it to beat the green monster and go through another wooden door. and there she will be!

hope this helped u!

First of all, its Link's little sister and you'll need the master sword.