I'm currently studying Biology at a UK university.
Obviously UK and the US are very different locales, but I had a pretty similar dilemma when choosing my A-Levels. I already had high predicted grades for Biology and Chemistry, but I had to chose between Maths and English Literature. Eventually, my grades pretty much decided my options for me (100% in English Literature ... and a crappy D in Maths
), but even so I was hanging in for the subject I enjoyed more. In fact, the Maths involved in Biology is almost entirely Statistics, so Calculus is less relevant than you'd think.
I'd chose Spanish, simply because maintaining foreign language skills is CV gold.
