You’ll need a Cat Suit to collect most of the items in this level, but you also pick up a few Super Bells along the way so make sure you get them. Speaking of which, hit the ? Block at the start for a Super Bell then jump on the raft to start down the river. Climb up the red fence to reach a higher level where you’ll want to stay for a while.
Run along this tier to a trapeze, then drop down for the Red Ring and the Super Bell you receive for collecting all the coins just be sure to dodge the Piranha then climb back up the wall. Take another trapeze to another high platform where the Stamp is located. Drop down from here onto the raft then take the clear pipe when you can safely move through without falling into the poisonous river to collect Green Star #1 .
Stay on the raft to reach the Checkpoint Flag a ways down the river then jump back onto it. Climb up the red fence to reach the second level with the Green Star Ring . Collecting the coins isn’t simple, some are on moving platforms but if you get them all you receive Green Star #2 .
Ride the raft all the way down the river then rotate the camera so you aren’t looking sideways down the river but straight down it. Spot Green Star #3 high above the Warp Box on the back wall, bypass the Box and claim the Star first.
Use the fences in the final area to cap the Goal Pole.