Visit the village that has the windmill. If you are young Link you attack one of the ladies cocos. When cocos start attacking you, jump into the ( hopefully by now empty ) well. But, if you are old Link you must have the long shot and shoot the pole in the lower window of the windmill. Then attack the coco until the coco starts attacking you and jump into the well. If you look up from the well, you see cocos fly down but not hitting you.