What kind of things should I be involved in my senior year?

I am going to be a senior in high school in septembet. I am very involved in band. I play flute, and I am in the color guard and twirl the flag, also I am color guard captain this year. Plus I have a job in a grade school tutoring 4th graders.
I have been wondering what other kinds of things I should get involved in such as a club, sport, volunteer work, ect. So if you have any suggestions that would be great!
Also any advice for a high school senior?