Show up in the best possible shape. Make sure you know exactly how to get there and, if you drive, just where to park so that you can arrive 15 to 20 minutes before the scheduled interview time. Go to bed early the day (or the days) before the interview so that you look rested and healthy on the big day. Bring an extra copy of your resume, CV, and/or references in case your interviewer wants to go over any points with you or neglects to bring their own copy.