You are Diddy, and you're looking for the bonus barrel containing the DK Coin. Where and how do you get to that bonus barrel?

Jump on Cat O' 9 Tails while he's spinning, and let him throw you to it.

Dodge Cat O' 9 Tails and team-up throw Dixie to the tracker barrel above the bananas.

Make your way to the right to the next platform, and team-up throw straight up.