Unless you have top-end grades, course rigor, and test scores, and are aiming for highly selective schools in competition with numerous other applicants with top-end grades, course rigor, and test scores (where extracurriculars are needed to differentiate between all of those applicants), the extracurriculars are probably only a minor factor compared to grades, course rigor, and test scores at most schools. An exception may be if you swim (or do some other sport) well enough for athletic recruiting.