Head to the Private Oasis (E5) and approach the door of the Cabana. The snarky door butler will refuse you entry until you show him your Cabana Deed. Enter the Cabana and grapple onto the horizontal bar hanging from the ceiling. The fire in the fireplace will go out, revealing a secret passage beneath it. Enter the passage, then take the first right.
Follow the path until it forks. Take another right and drop down the ladder. Enter the hole on the same wall as the ladder, then follow these directions if you want to score some extra Rupees on your way:
Go 
, 
, 
to reach a room full of pots that are full of Rupees. Turn around and crawl back in the hole you entered this room from, and go 
, 
, 
for a second room full of Rupee-filled pots. Now back out of the room and go 
, 
, 
to reach a ladder leading out of the tunnel system.
Hammer down both pegs to open both of the gates, then head through the passage on your left and jump down the ladder.
Head through the hole directly in front of the ladder and follow it to the other side. Climb the ladder and hammer the peg on the room’s right side, then jump down the hole on the room’s north end and defeat the ReDeads. Break the pots in the room to reveal another hole. Crawl into the hole and up the ladder at its end.
Stand on the Wind Crest and play the “Wind’s Requiem” to make a treasure chest containing Triforce Shard #1 appear. Turn around and hammer the peg to your right and head through the gate after it opens. Go through the opening on the room’s northeast side and take an immediate right.
The warp leading out of this maze will be in the room ahead.
