My friend was accepted to Stanford RD, and in addition to being an excellent student, he was VERY passionate about music (so passionate that he did world tours and played on every continent except, obviously, Antarctica :D). He is absolutely positive that the adcoms saw his passion and accepted him as a result.
That being said, I’m sure you don’t have to take worldwide tours or anything of that sort, but pursue your passions!!! This will help you tremendously.
Invest time in the causes you care about, rather than “participating” in many extracurriculars in which you do not or cannot invest that much time. 