Funny, I'm reading a book somewhat related to this topic at the moment (Never Let Me Go by Kazuo Ishiguro if anybody was interested).
I suppose I miss being fairly naive and not being so cynical about things these days. I don't suppose naivety is a good trait, but it's certainly an easier one to live with. In more tangible terms, I suppose one of the things I miss most was being more active and having time for it. Playing football and riding my bike around North Wales. I think if I had a bike these days I'd really quite enjoy riding down the promenade by the sea when the weather picks up a bit. Perhaps I'll have to see about getting a bike. Suppose it might be useful to have for university.