Answer:
I can only be played on a windy day. What am I?
I am lighter than the material I am made of. You see parts of me but more of me is hidden underneath.
I am the place to turn to when nature calls. What am I?
Everyone has me, but nobody can lose me. What am I?
My days are numbered. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.