In the Southeast Sea, navigate towards the area to the south to detect a new island not present on your nautical chart (picture1). This particular curved island should then immediately remind you of something... Walk towards the top screen and drop into the combat area. Then eliminate the two cyclops to get a drop of courage as a reward (picture2). Then go back up thanks to the breaths of the winds.
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Two large green rupees as well as a large red rupee also remain to be found on this island. Search the ground at the places marked on the ground. Dig exactly at the locations shown in pictures 3, 4 and 5 to quickly find these treasures. Don't forget to lift all the rocks to find other marks to dig.
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By browsing the bottom screen of the DS, you will then eventually see a chest appear. Open it to collect 300 rupees at once! (picture6). Another Drop of Courage is not far away (picture7). Then just dig into the lower-left corner of the DS bottom screen. Finally, you can even access a game by talking to the big Goron located north of the bottom screen (picture8). Then pay 50 rupees to play a game. Note that you will only be able to play it from a certain point in the adventure (after the Goron Temple adventure to be more precise). To get out of this corner of the island, dig in the top right of the area and let yourself be carried by the winds.
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