Music is the biggest one. First only because it was my passion all my life, before I ever thought of having a family.
Family is also a big one. Before I became husband and dad, it was my mom & dad & siblings. Now it’s 9 y/o daughter, wife, and adult children.
Travel. I have traveled a lot in my life. I could probably write a verse or two of my own to the song “I’ve Been everywhere!”
Language…I love the study of language. When I write, I’m a stickler for correct grammar, except when a grammatically incorrect version will produce a desired effect. When I was a kid, I used to spend hours with “Webster’s Unabridged” following up the etymologies of different words. Also related is a curiosity as to the meaning of names, both first and last.
Science/math—I’m a pretty big geek when it comes to anything technical. I especially enjoy conversations when they begin to blur the boundaries between science and philosophy.