OK, one thing you can do is to work in positions directly related to your field of study. I have friends with biology degrees who work either as lab assistants in universities, or else somewhere in the bowels of a Big Pharma company doing... I don't know what. Most of these sorts of jobs don't tend to be that great though -- in a scientific organization anyone without a PhD is probably not going to be able to rise very high.
A second thing you can do is... pretty much anything else! If you're not going to be specifically putting your brain to work on hard-science problems then you can go write software or work for a bank or be a management consultant or... I dunno, fly aeroplanes or join the military or do whatever. For a job not requiring any specific knowledge I'd always prioritise a science major over an arts major, simply because I'm more confident that the science major will be numerate and understand how to solve problems.
Honestly, a lot of degrees are really largely meant to prepare you for grad school, and you just named three of them. In a perfect world, college advisors would let you know this before you signed up for the major.
Graduate school is a good next step. Either continuing study of a hard science or moving to computer science with an eye of working at the boundary of computer science and real science.
I hear it pays well though.