From the Super Mario Wiki
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The player starts off on a platform next to a Flip Panel Switch which leads to another platform near some poison water. In front of the poison water is another Flip Panel Switch and three ? Blocks, the middle one contains a Starman and the far left one contains a Poison Mushroom. Next to this is a small platform with an invisible block on it that contains a Statue Leaf. After this section is another section with a Flip Panel Switch which leads outside and then back inside where there is another Flip Panel Switch which leads to a Warp Pipe.
In the final area is a Flip Panel Switch that leads to the Goal Pole.