Of course, you’re on the right track! I do the same, several activities I’ve done for CAS such as fundraising, charity walking, free computer assistance to my community, competitions, etc. I can show to colleges that I’ve done them. This is why after IB you’ve got a great list of achievements, activities, hobbies all organized in a list to show to colleges; with hindsight, this is what has made me appreciate CAS more. Just don’t forget that you can not get paid for a CAS activity or it is invalid.