Question

Your school does not have a playground and students feel the need for the same

Answer 1

All work and no play makes Jack a dull boy"
This is what is being taught to us in the school.
Every child along with studies needs to participate in extra curricular activities.
Without a playground ,   its unimaginable for children.
A playground is necessary for every school.
  I would write a letter to the principal  about the necessity of a playground  for children.
Till the playground is available, certain alternate arrangements can be made like ,taking the children to a nearby park under the supervision of the respective teacher.