Besides linguistics, I read books, take photos, and listen to classical music.
I love Bach and Chopin. I myself can play the piano and violin, though not in a professional level. I love reading musicology, especially books by Charles Rosen. There are many of my favorite musicians in 20th century, e.g. Wilhelm Kempff, Fritz Wunderlich, Mstislav Rostropovich, Wilhelm Furtwängler, Arturo Benedetti Michelangeli, Rosalyn Tureck. In terms of performers who are still active, I like Gidon Kremer and Martha Argerich. I should say that music and musicology gave me many Aha! moments in understanding the structure of human languages.