Swam Song Lv 6

[Sandy]

Where to begin. I have found 2 windmills but can't get in very far. Is there a 3rd door to flip the switch? What am I suppose to do in the windmill with the closed sign? how do I get to the lower level where the 2 chest are?
:confused:

[elise]

the screen above the one where you have to give bait bomb the left wall and you find your way down ;)