It's all very well everyone getting worked up about a rich celebrity going off on a round-the-world jolly, but there's another lady doing something far more worthy who should be getting this kind of attention. Obstetric surgeon Dr Webster is using a C182 to visit ~25 countries through Africa to provide medical training to gynecologists and midwives throughout the region, as well as donate equipment in the training locations. The flight has currently made it from the UK as far as Guinea Bissau and is planned to continue to Cape Town.
If your Only motivation was to train gynecologists and midwives in 25 African countries, do you seriously think you would choose to do it using a C182?
I suspect the lady seeks the adventure of the undertaking as much as she desires to help the needy Africans, nothing wrong with that of course.