Many, many or just a few extracurriculars...?

While colleges like to see that students have participated in extracurriculars, they also want to see that your grades haven't suffered from all the outside activity. As long as your grades are doing well and you're not feeling stretched in too many directions, keep doing what you're doing (and more, if you feel you can). Your extracurriculars just show that you are a well-rounded individual.