At least in my experience, I've found that I've been most successful when I pursued things that I was truly interested in, without any thought as to how this looks on a resume/future application. I took the classes I thought I would like the most, pursued the extracurrics I was most interested in, and only took job opportunities that I liked. This worked out really well for me, because since I was happy, I wanted to put in the work and did really well.
So my advice is - do what you like. On the basest level, all that matters for law school admissions is GPA/LSAT. Your major, extracurrics, jobs, etc. are all irrelevant (it's good to have them, but it doesn't really make a difference as to whether it is Club A or Club B, Major A or Major B, etc). Pursue what interests you, what you think will make you happy, and you'll probably find yourself to be successful.