Answer:
Hoofed frolicking.
Lighter than what I am made of, More of me is hidden Than is seen.
Two little holes in the side of a hill. Just as you come to the cherry-red mill.
A house full, a yard full, a chimney full, no one can get a spoonful.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?
Brings the sky a lot closer.