I’d like to take an online LSAT prep-course; I was thinking Princeton Review, unless there are better ones out there I don’t know of?
I'd recommend PowerScore. I didn't do their course, but their self-study books, known as the Bibles, were immensely helpful to me.
My biggest question is about my international experience. I have dual nationality (USA, France), I’m fluent in four languages (English, French, German, Italian), and I’ve lived almost half my life in Europe. Also, through my college I have the opportunity to travel every semester with a small group to study a specific country or region and do some research there. Finally, I obviously attend and international college. Is this experience something that’s going to play much in law schools’ decisions to admit me?
Does your school grade on the American system? If not, you may need to get your GPA converted to an American GPA for LSDAS.
Your life experience might make for an interesting personal statement, but as a soft factor, it's not exceptional.