Questions on Utilitarianism

1. How is utilitarianism different from classical hedonism?
2. Why bother telling people that they ought to promote happiness when they are naturally inclined to do so anyway?
3. What are some objections to using the utilitarian principle as a basis for making moral judgments?
4. How does Mill's view that "it is better to be a human being dissatisfied than a pig satisfied" highlight his claim that a utilitarian must distinguish impartially between higher and lower pleasures?
5. How (and by whom) are certain activities judged to be qualitatively superior in terms of producing pleasure?