Do you have any tips or advice for performing well, as well as getting to most from this internship?
You'll have a ton of fun working with other professionals and you'll learn more than you've learned in all of high school. You'll have to meet deadlines that matter and you'll have to make decisions based on given factors.
Is this an unpaid internship, where you'll be assigned a mentor and you'll get more out of it than the company? Or are you doing actual work, but not getting paid for it? If you're doing actual work for the company, they are legally obliged to pay you. Make sure you read into your state's laws to make sure you won't get into any trouble by doing work you're not supposed to.
My biggest advice to you is to go in with an open mind. You'll learn much more that way.
If you want to chat more about it, send me an email at zchlatta (at) gmail.com.
The wording here is fairly misleading. I want to make it very clear that the existence of an unpaid internship does not get the intern in trouble (with the government). It's the employer who would get in trouble (with the government). In that sense there is no such thing as getting "into any trouble by doing work you're not supposed to."