First, you should learn a lot. You should be given professional assignments and not only clerical or maintenance duties. (Occasional clerical work is OK, but in general you should be given tasks commensurate with your educational background.) You should meet lots of people in the field. You should attend meetings and begin to build a network of contacts for future employment. You should receive clear instructions about tasks to be accomplished. You should get story bylines, clippings, photo credits or videography credits that you can show to prospective employers. You should be able to get letters of recommendation from your site supervisor. It’s not unusual for an internship site to hire an intern full-time upon completion of the internship. However, this is often a matter of availability of a position and you should not feel that you’ve failed if you’re not hired.