<p>I'm an advocate of taking the physics-for-engineers class, even at risk of getting a C. I did it at my school, got a C+ (I'm an English major, and CU Boulder has pretty well regarded science programs, namely aerospace engineering), and though it hurt my GPA (3.4! Ick), I got into Barnard (they accept 26% of their transfer applicants, similar to the rates of some of the schools you're looking at). DON'T just take intro level courses if you don't have to, and DO take heavy courseloads.</p>
<p>Also, definitely retake the SAT, just so that if you have to send it, they get both scores. Then your transition from flake to good student will be more pronounced.</p>