The Pirates' Fortress

Head to the east side of the bay and grab a Red Potion.

Go to the northern end of Great Bay Coast and find the wooden boards with skulls at the seafloor.

Put on the Zora Mask, sink to the bottom, and use “R” to break the second board from the left, revealing an entrance to Gerudo Lagoon.

In Gerudo Lagoon, wait for the last of the four sailing Gerudo Pirates to pass, then swim to the other end.

Use the Zora Mask and sink to the seafloor to find three chests with Red Rupees. Be wary of Skullfish.

Climb the ramp at the far end and use the Goron Mask. Stand on the platform and use a Ground Pound to open the gate.

In the Water Channel, break boards to navigate. Pull out a block, go through another boarded area, and swim over walls to the center to find a chest with a Red Rupee.

Push a block from the inside, then go to the water pump to be shot upwards. Avoid Spike Mines on the narrow path to the end, where another chest with a Red Rupee is located.

Put on the Zora Mask and use Double Cutters to hit the Crystal Switch on the second level. Leap into the water and swim into the next area before the gate closes.

In the third room, avoid Spike Mines and swim to the ladder. Step on the floor switch to raise bars blocking a Crystal Switch.

Hit the switch, then ride the water pump up. Leap off to a platform to avoid a ceiling Spike Mine.

Use Double Cutters to push Spike Mines into each other. Hit the visible Crystal Switch to reveal an exit to Gerudo Lagoon.

Go around the corner and up the ramp to reach the Pirates’ Fortress.

To get the Stone Mask: Clear out the middle area, then rush to the center. Use the Lens of Truth to spot a fallen soldier near the tower. Talk to him and give him the Red Potion to receive the Stone Mask, which makes you invisible to most enemies.

To get the Hookshot: Put on the Stone Mask and climb the tower ladder. Pass the Gerudo Pirate on the bridge and enter the next room. Shoot through the bars to hit a beehive, causing the Gerudo Pirates and Aveil to flee. Leap down and open the chest to collect the Hookshot.

To collect Zora Egg #1: Use the Hookshot to latch onto the wooden plank above the fish tank. Defeat the Blade Trap, then drop into the tank with the Zora Mask on and use a Bottle to collect the egg.

To collect Zora Egg #2: Exit the room, go left down the stairs. Use the Hookshot to reach a target on an upper platform to the south. Open chests for Red Rupees. Enter the nearby room. With the Stone Mask on, run through the area to the next room and defeat the Pirate. Grapple the wooden board above the fish tank, defeat the Shell Blade, and collect the egg with a Bottle.

To collect Zora Egg #3: Exit to the outside and go to the northern end. Grapple targets to enter a room. Walk past the Gerudo, defeat the Pirate in the next room. Use a wood plank to get above the fish tank. Defeat the Desbreko, hop in, and collect the egg with a Bottle.

To collect Zora Egg #4: Hookshot to the upper level. Enter the final area, move past Gerudos to the center where a chest holds a Silver Rupee. Defeat the Pirate in the second room, then enter the final room. Hop into the fish tank and bottle up the final egg.