I would take up several charitable causes, including environmental stewardship/conservation/protection, endangered species protection, autism research, childhood disease research, prevention of human trafficking, science education for girls, etc. etc. I would also try to learn several new languages, including Spanish, French, and Italian. If I could actually take a political stance, I'd push for LGBTQ equality, and much higher taxation of the rich and corporations.
I despise parties, so I don't know how well I'd fare with having to attend gala after gala after gala and look absolutely immaculate for each one.
As for luxuries, I'd probably get a hybrid SUV or sedan with a custom purple paintjob, built-in GPS, and a rockin' speaker system. Clothing-wise, I'd opt for Burberry trenchcoats, Calvin Klein suits, and Rock & Republic jeans.