T'was fun reading the things here. I have a dream of being like this so..
If I were born a daughter of a reigning monarch, I'd strengthen the promotion of causes against prostitution (esp. child prostitution), human trafficking, drugs, etc illegal and absolutely immoral even if it would cause my death because I know such things are so controversial.
I'll warn my teachers/profs that they must give me grades according to my performance. They must not overrate/underrate me. They must be fair with me.
I'd not attend formal occasions of other royal families though, even if everyone in my family is invited. I'd make it clear that's not one of my agendas. I'll just have mama or papa explain to uncle and aunt that their stubborn niece can't be dragged to attend.
However, I'll go to my uncles and aunties and ask permission from them to let me go through their royal history archives, and all photo albums past and present! Hehehe!
Like Mariel, I would visit hospitals, most especially hospitals in third world countries to see for myself what they lack. I'll try (and maybe force my papa) to give me money to buy medical equipment/facilities one at a time, or launch a donating campaign for this cause. I will definitely not take even a cent from the donations!! I hate stealing! I will accompany my assistants when they buy so that there'll be no anomaly happening.
If ever there will be cameras following me in my personal outings, I'll not worry. They'll just go away when they realise I went to an ordinary mall and do my groceries, eat somewhere, whatever very ordinary things people do. Those aren't worthy of publishing. With the love life, I'll also just keep cool. Anyway, boyfriend and I will not do something attention-grabbing. We're not into that. And we'll just go to gardens, parks, wherever scenic. If we want souvenirs of our trip, we'll approach one papparazzi and ask him/her "Please take a picture of us. The scenery is so beautiful isn't it?" and hand that prazzi our camera xD
I will be close friends with Prince Harry and introduce him to very nice women who will love him for who he is inside! I'll be his intrusive matchmaker.
If I were born to a reigning monarch's sibling or distant relative, I'll be finer. I'll not attend even family events except those very private-no photographers events