Jump Farther!
Okay, the only place this worked so far was in deep jungle. It might work in other places but not shure. Anyway if you go to the tree house in deep jungle you can see a boat suspended by some rope in the front of the tree house. Work your way to the the very top, (you'll know cuase there is a big hole in the roof with a chest on the opposite side) and you should be able to see the boat easyily. Now all you do is jump off the tree house and start swinging the keyblade as you fall. After around 7or8 swings you should be over the boat and there is a chest inside!
Theres loads more info this game, right here, with some cheats and tips, answers and Kingdom Hearts walkthrough.
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