From the Super Mario Wiki
Cloud Cruising is the aerial level 3-1 in Yoshi's Story. In this level, the Yoshi must ride on snakes that climb higher and higher into the sky. Also in the level is the friendly green Dragon that the Yoshi can ride while it curves up and down. Shy Guys fly around directly in front of the "pathways", trying to hit Yoshi. Cloud N. Candy is fought at the end of this stage.
As the Yoshis were walking, they found a trail of clouds that led to the sky. The Yoshis were afraid of falling, but they walked on the clouds anyway. Up in the sky, they met Cloud N. Candy, who was mean, but tasted sweet.
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