Before jumping on the cloud
near the beginning, head to the left and activate the pink
blocks (by holding A or B) and then get the blue star.
Red
Star
Before you reach the arrow
pad area, head over to the area with the two bumpers. Flip
them red, and you can either charge Kirby up to be
invincible by hitting the bumpers repeatedly (have to be
fast!) or you can do a flip jump diagonally (takes a few
tries) to get the red star.