Internships
Make sure that your eyes and ears are always OPEN.
I was lucky enough to have lots of internships through college, and I found that one of the best things I could do was to keep my head down, and my eyes/ears open. I made sure to always ask LOTS of questions. That's the only way you can learn, and my questions were not always about clients or the work, they would be about busy season, the firm, and the expectations once you're a staff member. There was a HUGE gap between intern responsibilities and expectations versus employee. Make sure that you ask about those differences so that you are 100% prepared. Remember that people might also be ‘sugar coating' so add more that they specify (If they say 70 hours, go ahead and add at least 5 to that).
Pay close attention to the first year staff up to seniors at your firm. How many hours are they working? How stressed to they seem? Realize that sometimes what you are told to expect as a first year and what you witness occurring might not always align.
During busy season our ‘true colors' can come out. You're tired, cranky, stressed, and just OVER it. So while your and intern make sure that you don't take anything that is said to you in a harsh manner personally, but do NOT dismiss it. No one's perfect and stress can do bad things to people. But you have the possibility to see first hand how a team/firm works together during the most stressful time of the year. Are they assisting each other and pushing through it? Or are they falling apart and taking one another with them?
These are a few of the things that most employees will not tell you about, especially if you ask about them directly. But in the 11th hour they're going to forget (or just not care) that there is an intern watching and they are going to get it done however they need to. Make sure that you witness that and decide if that's the level of stress you are okay with signing up for when you join a firm.
Professors in college always stress that you are using your internship as a trial period to convince the firm to offer you a job. But in reality it's just as much a trial for the firm to convince you that you want to be a part of the team.