What should be my next step? (Rising Junior)

I'm kind of lost as to what I should be doing to stay ahead of the game at this point. I'm really determined to land a good internship next summer but my one major weakness is my 3.15 GPA, so I know I have to work many times harder just to make up for it.

Right now, I'm interning in Beijing for an organization comprised of many business executives who donate to charitable causes and do community service. I don't do anything Finance related, and was told this is more of a networking opportunity but I don't really have much desire to be working in mainland China so I don't know how worthwhile this will be yet.

I'm also involved with doing some research for a hedge fund company here.

My question is, are there other things I can and should be doing this summer that will be helpful to me next recruiting season?

I've also been calling alumni at my school at various ibanks back in the US, but it hasn't gone too far. Should I start calling more firms to ask about future internship opportunities or what?

Thanks a lot for reading if you got this far.