Sites of Interest
Location: Barrel Cannon Canyon
Items: 14 Bananas, 1 DK Barrel, 1 Red Balloon
Walkthrough: In a series of barrel cannons, right after getting the "O" kong letter. Once inside the first of the 3 final cannons, miss the next barrel cannon to punch a hole in the wall.
A purple cave with six vertically positioned barrel cannons. The barrel cannon will start to move up and down once you get inside of it. Just correctly aim for the item on your path and you'll never miss the next barrel.