Ikana Canyon
Your final task in the game before facing off against Majora's Mask will be to travel east of Clock Town to Ikana Canyon and solve the mystery of the Stone Tower.
To get into the canyon, you must first have Epona (which you should by now), the Garo's Mask, and the Hook Shot.
Ride Epona east of Clock Town and jump over the two fences to get to the large cliff. The guy at the top won't let Link in, but if you put on the Garo Mask, he will make a Hook Shot target appear, which you can use to get into the canyon.
From there, walk forward and use Ice Arrows to turn the Octorocks into frozen blocks and then jump across to the dock on the other side. After that, use your Hook Shot on each target on the ledges to reach the top of the cliff. Once up there, you can activate the Owl Statue to never have to go through that again.
After activating the Statue, run to the far rear of the area and enter a cave. Inside, you will encounter another ghost - only this one will continually damage you. The way to get past this part is to simply pull out your Ocarina and play the Song of Storms (taught to you in the Ikana Graveyard side-quest). When you play it, the pain will stop and the river will be restored.
Return outside and you will see a girl playing by the river. You now need to get past her to get another mask. If you have the Stone Mask you can simply put it on and run into the music box house. If you do not have the Stone Mask, you need to plant a bomb to distract her, then run into the house.
Inside you will encounter a mummy, instead of attacking it - play the Song of Healing and he will give you the Gibdo Mask.
Once you have that, your next task will to be to dive into the well on the north section of the area.
You are about to face a quest that requires you to hand over a variety of items to progress. You can get almost all of the items inside that dungeon -- but you do need Magic Beans and a Red Potion (3DS) or Blue Potion (N64) to get started. If you've got a bunch of bottles, you might as well come prepared and get yourself a few items by cutting down grass or buying them in advance. You can get fish (in pools inside), milk, nuts, bombs, etc. througout this mini-dungeon. Note that there are two items that are tough to "import" from outside -- definitely just get them in here: 1 Bottle of Hot Water (you can get this outside, but by the time you get back to the well it would have cooled), 1 Big Poe.
And the final thing you need is the Gibdo Mask, which will allow you to speak to the mummies inside the well.
TIP: All of the items that are needed for the well are much easier to get if you have all six bottles. The locations are:
- Get the medicine for the sick witch in the Southern Swamp. It will come in your first bottle.
- Complete Romani's notebook entry at the ranch to receive the third bottle full of milk.
- Win the Goron races and you will get a bottle filled with gold dust.
- Win the Beaver races in Great Bay (you need the Hookshot to get above the waterfall where they are held) to get this bottle.
- Complete the cemetery side-quest to get this bottle.
- Complete Madam Aroma's epic notebook entry to get the final bottle.
You need the above items to barter with the Gibdos inside the well to pass through the doors that they are guarding. When they ask for an item, give it to them and they will let you pass. For example, when they ask for creepy crawlies, that's obviously bugs. Note that there's also a difference between hot water and regular water -- you'll need both. One room contains a Poe. Defeat him and his soul will be left on the ground. Bottle it to give to one of the Gibdos. Finally, one Gibdo asks you for milk. You can optain it inside by playing Epona's Song when standing next to the cow (as long as you have an empty bottle).
At the end of the well you will enter a room where there are four unlit torches. Use your Fire Arrows to light them and a chest containing the Mirror Shield will appear.
With the Mirror Shield in hand, you are now ready to tackle Ikana Castle and then move on to the final dungeon of the game.