Literature and Women's Studies.
(okay, and then I did a post bac program, so I guess you weren't looking for that kind of answer...)
But I definitely could have started out with a bio/humanities major no problem at both schools I attended (started at UCSD, transferred to UCSC). It depends on how much you like school, how much you like your classes and how fast you read (I'm not kidding). I also worked full time throughout school, albeit for a coffee shop so I had odd hours that allowed me to do so.
When I entered college, most of my GEs had been waived through testing, and that also helped- so if you have a situation where you're a semester or two ahead, go for it, but do it because you like it, not because you think it'll "look good." It's not worth going crazy, and you'll be busy enough with studying for the MCAT and what not. When I was in my postbac program, I had a boyfriend at an art school nearby. Kept me sane- I basically got to audit classes and play with clay when I needed a break from Ochem (there's only so much you can study in a day).