Suggestions for obtaining a summer internship?

<p>Hey guys!
I'm already starting to think about my next summer internship...
So for those of you who don't know me, I'm currently a senior in high school. I was an intern developer last summer for a commodity information firm, and now am an intern (ugh... Operations :/ ) at Morgan Stanley... Smith Barney. :/</p>

<p>I'm in the DC area, and I want to go up a notch, even if that means that the internship is unpaid (as opposed to my previous internships.)</p>

<p>I know there are quite a few hedge funds in DC (Carlyle Group, as an example) but how would you recommend for me to even attempt to garner an internship at such a firm? Just cold-call? Should I even bother trying? Or perhaps I should try a different type of firm...</p>

<p>Thoughts? I'd greatly appreciate it!</p>