Talk to Yolanda when she is inside the Orcarina Inn and when she has at least 5 hearts. She will tell you that while she was out for a walk, she found something floating in the waves. It turns out to be some sort of map, but Yolanda has no use for it. She gives the strange map over to to you.
Finn can't read anything on the map because it's too wet from being in the ocean. He suggests that you build a fire to dry it off. Use your matches to build a bonfire, and then place the wet map on the fire. It will dry the map so you can read it. Do not forget to water your bonfire when you're done using it!
The map tells you to look for a thin object that sparkles and watches over the sea. From there, you take 5 steps south and 10 steps east. The map also contains a warning; you can't show it to anyone else. The warning is signed by the great pirate, Jonney.
The first clue is obviously the Lighthouse in Harmonica Town. It is tall, looks out to the sea, and its light sparkles. Head over to the island where the Lighthouse is and start pressing A near the pointy edge of the green grass when you cross over the bridge. The two of you will find a buried object, which turns out to be a Crystal, a Perfect Coffee Bean, and another clue.
The second clue tells you to look for 3 squares and 3 circles near somewhere that dazzles and shines. This one is a bit tougher; the dazzling object the clue is referring to is the giant shiny kettle on the General Goods store sign. The 3 squares and circles are the barrels and crates on the side of the building. Check the side out by pressing the A button and you'll find an Amethyst, a bag of Summer Seeds, and the next clue.
The third clue tells you to look for a flat pumpkin. If you travel to Marimba Farm you'll find a sign hanging from the left-side of their porch that is the shape of a pumpkin. Press A when next to the hanging pumpkin and you'll find a Black Pearl, a Rock Salt, and another map.
Clue number four tells you about a bell at 12 o'clock, a staircase at 6 o'clock, and a "torch" at 9 o'clock. The spot on the map is the Celesta Church Plaza. When you walk to the plaza the church bell is north of you (12:00), the stairs are behind you (6:00), and there is a street lamp near the staircase (9:00). You then have to wait for the street lamp to light up (becoming a "torch") at 5:00 pm. You can then press your A button to find a Topaz, a Shining Perfume, and the last clue.
This clue tells you to spread your wings, gaze out, and look for a reflection to appear at 8:00 (am). For this clue you have to take Pascal's boat to Toucan Island in the early morning. As you leave the boat dock, walk west until you reach the shoreline and start pressing the A button around the area when the time hits 8 o'clock in the morning.
The two of you will dig in the spot where the last clue was, but you'll only find a cheap Glass Orb. Pascal will check to see what you guys are doing, and realizes you have been following the clues that he created a long time ago! Pascal is actually Jonney the great pirate.
He tells you that he was never really a pirate, but when he was younger he did have a yearning for adventure. Pascal points out that there is a chest buried there, and you'll end up getting a Pirate Bandana and a Pirate Eyepatch for you to wear. The items will automatically be sent to your dresser.