Tingle Island
Tingle Island is one of the islands of the Great Sea in The Wind Waker. It is the home of Tingle and his brothers Ankle, David Jr., and Knuckle. Link will make several visits to this island during his adventure for the sole purpose of asking Tingle to decipher the Triforce Charts he has collected.
A Piece of Heart can be retrieved from the bottom of the sea by defeating a Big Octo located near this island.
Fishman's hint on Tingle Island:
Let me tell you a little something about that island over there, small fry... The guy who lives there is named Tingle, but he won't grow up and act his age. He still dresses like a little kid. That...is not normal. Still, from what I hear, he can decipher maps like nobody's business! It just goes to show that you can't judge a person on appearance alone, fry! Of course, the thing about this Tingle guy is that when it comes to pay his deciphering fee, you'd better be ready to fork over some serious dough. Anyone who doesn't have a deep wallet won't be reading any maps, that's for sure.