To advance to the next area, Sora must collect all the available fruits. Walkthrough:Kingdom Hearts/Deep Jungle. In the end, Kerchak will give you the gift of launching you into there home, in the waterfall area.

Waterfall Cavern, Visit 1. Kingdom Hearts Guide Deep Jungle.

There are five areas in the slider.

From here, jump to the high ledge to find … Deep Jungle: Theme Music: Deep Jungle Battle Music: Having a Wild Time. Run to the back of the cavern, then jump up the ledges to find a Treasure Chest containing a Mythril Shard. The camera goes crazy and the platforms are misshaped. The player has to collect as much red fruit as possible, while sliding down the trees and avoiding obstacles.
Enter the Waterfall Cavern and hop up to the top of the falls, clearing the treasure chests along the way.

Go to where you fought Clayton and jumo on that ledge.

... You'll soon find yourself in a cavern with a tree in the middle and with lots of butterflies. Jungle Slider (ターザンスライダ Tāzan Suraidā) is a mini-game in the Deep Jungle world of Kingdom Hearts.

Enter the Waterfall Cavern now. This area is a pain to navigate. From the Kingdom Hearts Wiki: A world of information not accessible by Gummiship ... enter the nearby Waterfall Cavern and get to the top. At the rear of the top cave, there is the keyhole. Upon completion of one challenge, a reward is gained. nearby is the waterfall cavern place.

Deep Jungle: Waterfall Cavern.