I'm interested in just about everything. It's easier for me to list the things I have no interest in: cars and sports.
Things I've spent a lot of time on: writing, psychology (emphasis on therapy), feminism/gender studies/trans studies, programming/game design/modding
Things I've spent less time on: drawing, literature, music, movies, gaming, comic books, tabletop RPGs, philosophy, occultism, comparative religion, the nature of consciousness, medieval culture, evolutionary theory, neuroscience, sexology, queer studies, web design
Things I've spent even less time on: political science, history, sociology, anthropology, archeology, paleontology, marine biology, acting, urban exploration, mathematics, immunology
I wish I had a lot more time to study all of these things and a bunch of things that never made it onto the list.
Edit: Weirdly, I don't really consider reading a hobby/interest. I read books about my hobbies and interests. I will read just about anything.
I love Society. It is entirely composed now of beautiful idiots and brilliant lunatics. Just what Society should be.