I really liked being able to see how my degree may be applicable to different types of jobs, not just the obvious route. I liked learning from people who know the business and are passionate about what they do.
What I wish was different
I don't think I would change anything about this summer internship. Such great people and such a great experience.
Advice
One piece of advice would be not to underestimate yourself. Before walking into the office I was thinking, "how am I even qualified for this?", but after a few days I became very confident in my abilities to adapt to this new setting and apply my skills.