Grab the POW Block at Point 1 and wait for another gust of wind to blow coins near you. As soon as the coins are overhead, drop the POW Block to force the coins to drop onto the ground.
Go down the red pipe at Point 2 to find a secret, underground cavern with several tilting girders and coins.
Use the girders to reach all the coins, then take the pipe on the right to exit the cavern.
Either get a running start and then jump, or Spin-Jump up to the ladder at Point 4 to grab the Propellerhead power-up on the ledge above the ground.
There’s a 1-Up Mushroom hidden inside the Block at Point 5. Grab it before you make a right and pass through the Bowser flag.
There’s an alternate exit that is tricky to get to. You must have the Propellerhead power-up to reach it. Set up to the right of Point 7, under two blocks. When the wind begins to blow, Dash and make three jumps, hopping from one platform to another.
Right after the third jump shake the Wii Remote to start the Propellerhead and fly up and over the stone structure in the sky. Once there, hop up into the red pipe and you’ll find the alternate exit!