OK, I don't exactly know why, but really almost none of you has said what an astrophysicist does in everyday life. As I am one, I can.
My career path started in Europe, where the university system is slightly different. I did a BSc in physics and astronomy, then an MSc and PhD in astrophysics. Now I am (a common next step for people who want to stay in academic research) a postdoctoral researcher at the Space Telescope Science Institute, basically Hubble's home base. Every few years I will have to change jobs until I get sort-of permanent somewhere.
I am a theorist/simulator. This means that in everyday life I do basically the following: using rather complicated computer programs and powerful computers (I think a minor in computer science is a very good idea!) I run simulations of the large scale evolution of the universe. That is a rather small fraction of the job. The main work is in analyzing these, and for that you will need to take a specific topics from all of the many possibilities with these computer models. I choose to focus on the galaxies forming in the Universe (but could as well have chose on intergalactic gas, galaxy clusters, radiative effects, you name it) and I have to formulate questions to answer using my analysis.
Once the analysis is underway you will find that some questions can be answered using the simulations, some can not. You pick the ones that give an interesting new finding in the field of galaxy evolution and you write that in a paper, that will be submitted and eventually published in a scientific journal. Formulating the question is something that you will learn, not particularly easy, but not time consuming either. The first investigation, that shows whether or not it is an interesting thing to do that will lead somewhere is (for me) the most fun part. Most time goes in figuring out all the details, testing whether you really understand the problem and writing it up concisely for the publication.
The same will hold for observational astrophysicists, who use data from large telescopes (sometimes they will go there, sometimes they won't but they will never look through telescopes, only at computer screens). Writing grant proposals starts later in your career.
For an example of the research I and others did and what you write up about it (the 'new' ideas are usually in introductions of papers), you can have a look at
http://arxiv.org/list/astro-ph/new where new papers are posted every day (note: these papers are technical and far from easy to read). My own stuff is at http://marcelhaas.com/work.html and http://thesis.marcelhaas.com
Hope this was of any use. Cheerio,
Harcel