Brush Up on the Company and Yourself!

One of the best ways to figuring out what you hope to learn is by doing a little research on the company and position you are going for.  If you are, say applying to be an intern at a television station, it would help to know whether or not they allow interns to do on-air segments.  This can save you the embarrassment of gushing about your dream to be the face of the station within a year.  And although this is a purely hypothetical example, the game stays the same regardless of the situation.

Another way to understand your goals better is honest self-reflection.  If you know that you are not well-versed at spreadsheets, you should not be seeking a job that requires mastery of Excel.  Just because a job may sound good on paper or bring home a fat paycheck does not mean you should be going for it.  Be honest with yourself and recognize your strengths-- certainly you can work on your weaknesses, but don't hurt your chances of being hired by being unrealistic. 

The main thing to remember when answering this tough question is that only YOU know what you really want.  Through some research and meditation, you should be able to realize your dreams!