Advice from CS majors that transferred

I'm joining as an incoming freshmen as an InfoSci major but I want to switch to CS. With UMD's new selection process, it almost seems impossible switching to an LEP major. I contacted the CS advisor and they said to get involved with tech-related clubs and organizations on campus and work on side projects (but all of this doesn't guarantee switching). Please give me advice on what clubs to join and what to do on top of already taking CMSC 131 & Calc II this fall..