You only begin the stage with 30 seconds, with a bunch of +10 second clocks littered through the course, so you will want to grab as many as possible. You don’t want to spend too much time to go out of your way, though, as sticking to the main path will make things a lot more bearable. When you begin the level, run around and grab any clocks that are not out of the way, then begin moving to the right. Eventually, when you reach the two big rolling hills, you will find a Green Star Ring. There will be four coins on each of the two large rolling hills, so quickly collect them all to get Green Star #1.
Go north and to the right to find a green pipe, putting you in the underground area. When you have the choice to either go high or low, choose high and at the end, you can see that there’s an invisible cloud platform along the upper wall. Jump on top of it to find Green Star #2 in a hidden alcove. As soon as you come out of the alcove, drop down to the floor at the bottom and enter the green pipe for a bonus room. You need to light up all of the tiles on the floor, with the POW Block helping out some. Once you do this, you will be able to grab Green Star #3. Quickly exit via the pipe and continue right, jumping over the gaps and avoiding the Skipsqueaks. At the end, hop into the pipe and quickly grab the top of the Goal Pole.