It's all about the children and improving their lives. Plus the staff, plus the community, plus the buildings, etc, etc. No day is ever the same and you can't go into work saying 'I'll do this today' and so on (at least not in a small school) as children are unpredictable as are staff, parents etc. You try to be proactive and think you are succeeding but then something happens and you must react. That's what makes it special! If you want an office job then being a headteacher is not one - in my small school experience! Sorry sounds a bit waffly but it's from the heart.