under a pathway, in the area where আপনি and riku ha a 'triathlon' for the privilege of naming the raft, it's in a cave-like place and the entrance is covered দ্বারা a rock, I think.
to be আরো specific. Mushrooms (Three): One is in a hollow behind a rock, right পরবর্তি to Kairi. One is in the bushes on the other side of that same cliff. The last is in the Secret Place, the dark cave on the first side of the island (to the right of the treehouse). A cutscene will play there.
