From the Super Mario Wiki
When the player starts on the beach, there will be an Undergrunt Gunner firing bubbles at the player. To defeat it, the player needs to either Ground Pound the top of the enemy's mech or send coconuts by spinning into them a total of three times. Doing so will defeat the Undergrunt Gunner and open up the cannon. Like with the last mission, the player needs to use the cannon to fire at the small planet with numerous Octoguys and grab the Fire Flower, returning to the main planet and lighting the torches in the cave. Lighting up all three torches before the power-up wears off will reveal an Ice Flower the player has to use to cross the lake and jump up water spouts. The player must then climb a series of poles and swing on nails to move forward, touching a ? Coin to reveal Sling Stars along the way. Next, the player can use Water Shooters to get up over platforms and avoid the Fire Pressures. Once the player reaches a Fire Bar, they have to stand on the block the fire is connected to so the bubble from the Water Shooter can send the player to the next planet. Ground Pounding on all three stumps will cause the Water Cannon on the planet to start working, which will send the player to the next planet. There, the player must avoid a Ball Beamer and Ground Pound the large tennis balls in the marble to expand the watermelon inside, causing it to expand to the point where it will shatter the marble casing and cause the Power Star to appear.
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