First Get Yoshi Head to the Place where The boats come when they come back to Isle Delfino not out in the sea. Next WITH Yoshi jump into a boat not the water cos he will die, Once you are In a boat wait for it when you get to The Island with no Basket on there will be a yellow bird eat it for 1 shine sprite (Note: You have To collect the sprite)

If this cheat doesnt work try a different boat.