Hey so, I'm a junior and this is my first year of IB. My CAS Advisor has talked to us about CAS and gave us some examples for each. I want to hear some of your ideas for each or what you did. I'm mostly interested in Action though because Creativity is covered pretty much and Service is most like volunteering.
Find a friend and pick up a new sport/activity. I have been climbing for years and that is my action (find a local climbing gym. It's worth it). People I know do cc, someone's taking up yoga, go train for a 5 or 10 K or better yet a triathlon. Ultimate frisbee is something I know people are in. Go to a local gym and take Zumba or kickboxing. Go take a dance class (Latin dance is really fun). You can count pretty much anything for CAS