This is a grassy area. The double pipe to the right can be good use. When using the Super leaf Goombas coming out of the pipe can be stomped on repeatedly to get 1-ups. As long as you don't touch the ground. Further on you will find a pipe in the air with a piranha plant in it. Hit the switch in the block underneath the pipe to turn the blocks into coins. You can jump into the pipe. Keep going and you'll reach the exit.