Summer Programs for HS seniors (future college freshmen)

I took a look at the thread about summer programs for HS students (http://talk.collegeconfidential.com/summer-programs/343495-summer-programs-that-look-good-on-college-applications.html), but I noticed that those programs are mostly for HS juniors and sophomores.

I am a senior in high school, and in fall I will be attending university. Although my applications are already sent, and some decisions are already made, I would like to take advantage of this summer to do something that will reflect on my curriculum. I am from Italy, but I am attending a U.S. high school, and will be attending college in U.S. too. Do you guys have any advice on programs or internships for international students like me?