They are a good source of suggestions in this regard. Read those papers, then go back and discuss them with the professor. Therefore, develop contacts outside the department and the university, thereby gaining a new perspective on biology and on your own work. These outside contacts not only broaden your perspectives but may also increase your chances for a collaborative research project, a postdoc, or even a job. Join appropriate scientific societies, attend their yearly meetings, give papers or posters, get to know your future colleagues.
Meetings can be exciting and a chance to find out what is new.
On Courses Never pass up a lecture course from a great professor, even if it is somewhat outside your main area. Seek courses that challenge you to think rather than memorize. Auditing courses can often be an efficient way to get an overview of a field, at least if you are self-disciplined. Take short courses that can save you time over the years. If you don't know these crucial skills already, immediately learn speed typing and word processing.