<p>I’m not in a similar situation, I transferred to Berkeley (EECS) last year. This place helped me a lot with admissions and such, now I just stick around and try to be helpful. ^^;</p>
<p>Tutoring sounds like a good EC too. There’s no magic set of things to do that’ll get you in automatically, and there’s nothing that’ll kill your application if you don’t do it. Math/CS/Physics related things are great, and they can be helpful when you go to write your personal statements.</p>
<p>I think all the CS related EC’s on my app were pet projects (games and such), some contests (AMATYC, some engineering ones, more math), and maybe robotics club. Even if you haven’t done a whole lot, it helps to show that you’re passionate about your major, and that you enjoy participating in things. I got in with a 3.7-3.8 GPA, btw. There’s no magic formula, some people get in and some don’t. No one on here can say for sure what gets you in/out.</p>
<p>Honestly, it sounds like you’ll get in with any ECs you pick at this point, so good luck with whatever you go for!</p>