According to this ranking. :) I work in a biology lab at Caltech.
Actually I don't know if I'm the kind of biologist they mean, and furthermore when I looked a bit more at their methodology it seemed very shallow. And they couldn't take into account all the individual conditions (like whether the boss is sane) that can have so much effect on working environment. So I'm not taking it seriously.
I do like my job, though, and what I chiefly like about it is that it doesn't bug me. I don't feel stressed about work. No one's mean (to me), no one minds if I shift my schedule earlier or later (that's huge), and I've yet to suffer any injuries from sea urchin spines. Often free food, scientific talks, and other events can be found around campus. And the work itself is interesting, neither hard labor nor sitting at a desk all day. I get to move around a big lab bench and work at microscopes and shake sea urchins, and eventually I learn more about what the genes do. True, autoclaving the biohazardous waste isn't my favorite thing, but really I only do that an average of once a year.
One thing I'm sure of: if photography is your dream job, you should avoid taking out $140,000 in student loans at 18% interest for a four-year degree in the subject.