Scriptwriting, photography (tried to audit it one quarter, but it just wasn't the same), more Arabic, film courses, linguistics, history of science.
I should have done a linguistics major or possibly something in film studies.
My bio undergrad degree is pretty frickin' useless. Since I took such a wide array of courses (primate course, ecology, mammalian bio, biogeography, etc.), none of which built on each other, I've basically forgotten most everything I learned. It's pretty frustrating, in comparison to the math, etc. that I learned and managed to retain... the survey-level bio courses I took were just too general and too memorization based (as opposed to problem-solving based)... I'd definitely choose a different course if I could redo that experience.