We all need play, and time without schedules. That's true for all ages, adults to babies. These breaks from achievement and agendas are when one can synthesize what's been learned, reflect on successes and failures and create new ideas.
Free Forest School posted an interesting piece about just this phenomenon: older kids need play too. Play is not just for the early years. It is essential to growing the skill of curiosity and independent thinking. Check out what these FFS had to say about play for elementary ages and older.