One of the points that is often made on the private v state threads is that (depending on your circumstances) you might be better to send your child to state school and spend the money saved on paying for extras to enhance their education.
Coming at this from the other side, my parents skimped and saved to send me to private school and whilst I have fantastic academic qualifications I still feel that my education was very focussed on passing exams and not on all round experience. For example at the point where I left school at 18 I couldn't play a musical instrument or have any appreciation of music, my general knowledge was woeful, other than 1 trip to France I'd never been out of the UK, I'd never been to the theatre, I'd never had food other than the meat and 2 veg variety served at home. Looking back I think my "life education" was very narrow.
I don't want this to turn into a state/private discussion so I suppose my question is - money allowing, what "extras" would you pay for to enhance your DC's all round education? Music? Travel? What experiences do you deem as valuable?