Ask HN: What should I do if I don't get a summer internship?

Next year I'll be a senior (majoring in CS). I am currently studying abroad, so unfortunately I won't even be back in the US until mid June (and then have about two months left until uni starts again). I have a meh GPA (3.0) but a couple of side projects that I've put some time into as well as brief, crude work experience doing web dev for two university organizations through the university. Essentially, I'm looking at graduating without a whole lot of formal experience, so how should I look at spending the rest of my time (2 months of summer + 2 semesters) in preparation for getting a job? I'm quite concerned about getting a job doing something interesting where I feel like I have some sort of positive impact on the world, and I'm worried that with my current situation my options will be limited.