There are exactly twelve heart pieces hidden on Kohilint Island, plus eight heart containers hidden in the Underworld of Kohilint Island. Every four heart pieces make one heart container. Below is a list of the heart pieces broken up in the general areas in which they can be found in the Overworld. Dont forget:

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In and Around Mabe Village
1. Fishing Pond- Get the Big Fish in the Nook underneath you and inside its mouth is a Heart Piece
2. Well- Jump off the ledge in the Well just west of Mabe Village for a Heart Piece below.
3. Mysterious Woods- Outside of the Woods is a Heart Piece on a grassy platform.
4. Witch's House- Directly south of the Witch's House is a staircase. In the cave below is a Heart Piece that you'll need the Hookshot to get to.
5. Mysterious Woods- in the cave you pass through to get the Toadstool is a Heart Piece that you can get with the Power Bracelet.

Tal Tal Area
6. Water Cave- In the cave on the water right of Angler's Tunnel is a Heart Piece under water in the middle of the room.
7. Turtle Rock- As you emerge from the Turtle Rock exit by the Warp Hole is a Heart Piece.
8. En Route to Turtle Rock- when you go down the stairs past where you save Marin is a little nook at the bottom. Blow it to get Heart Piece you could see before but not reach.

In and Around Animal Village
9. Animal Village- In the small cave right of Animal Village (you can see the cracked wall from the Zora house) is a Heart Piece that you'll need the Rooster to get.
10. Yarna Desert- Bomb the North Wall of under where you fought the Sand Worm and there is a Heart Piece.

Ukuku Prarie
11. Kanalet Castle- In the southwest part of the moat is a Heart Piece accessable by diving.
12. Ukuku Prarie- There is a cave in the Prarie that had barriers that you need to dash through. Bomb the wall at the top of the cave to get into a room with a Heart Piece.