Due to the nature of the collectibles in this stage, you will probably have to play it twice. On your first trip, it’s best to go after all three Green stars, then do a second trip through it to get the Stamp. Start by hopping on Plessie and a little ways down, use the Splounders to bounce up to Green Star #1. Just past that Green Star, stick to the right side and bounce up to the Red Ring, then follow the trail and collect all eight Red Coins for a 1-Up Mushroom. Stick to the left side and bounce up the tiered water levels to reach another 1-Up Mushroom.
After dropping off the next ledge immediately following the second 1-Up, there will be a waterfall on the left side of the screen. Go through the waterfall and grab Green Star #2 here and a Super Star which will help you move through the final area. If you opted to go to the right side of the same waterfall mentioned, you’ll have to swerve around the track and along the way, you will find the Stamp for this level. If you went the way of the second Green Star, then you will need to perform a jump off the ramp to get back on the main course.
The final portion of the level will be coming up after the above Green Star/Stamp, which is a long hill that has the dash panels and a bunch of Splounders. Navigate to the dash panels and use those to gain speed, while avoiding/jumping over the Splounders. At the end, jump off the center of the ramp to grab Green Star #3 in the air. Once you finally land, enter the pipe at the end to reach the flagpole and the end of the level.