When you work on a big project for your internship make sure to make note of it on your resume. You don't want to be updating your resume months after your internship ended and struggling to remember everything you accomplished. You worked hard at your internship, so make sure you highlight that work on your resume!
When it comes to dressing for internships, it is always better to fit in than stand out. Look at how senior ranking team members dress and try to replicate it. There is wisdom in the time honored cliché that states, "Dress for the job you want, not the job you have."
It's always exciting to be included in meetings when you are an intern. When you do get called in to one make sure to come prepared. You wouldn't show up to class without a way to take notes, so the same thing goes for work meetings.
Smart employers view internships as a two way street. Interns should learn from their employers and employers should learn from their interns. For example young people in the workforce are usually very adept at social media and that's a valuable skill for companies. So make sure you show your employer what you have to offer. Who knows it could land you a job after college.
Good interns are well informed interns. That means not only learning about the company where you are working, but also their competition and industry news in general. So take the time to read professional trade journals and magazines and perhaps make a Google Alert for the company so that you never miss when they are mentioned in the news.