What is CAS? - Choosing CAS activies

CAS is designed to strengthen and extend students’ personal and interpersonal learning.
It's organized around three strands: Creativity, Activity and Service:

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From IBO.org

CAS enables students to demonstrate attributes of the IB learner profile and enhance their personal and interpersonal development.
Students develop skills, attitudes and dispositions through individual and group experiences that provide opportunities to explore their interests and express their passions, personalities and perspectives.
CAS complements a challenging academic program, providing opportunities for self-determination, collaboration, accomplishment and enjoyment.
CAS should be meaningful and can be profound and life-changing. Each student will have a different starting point with different needs and goals.
CAS is individualized according to student’s interests, skills, values and background.
Successful completion of CAS is a requirement for the award of the IB Diploma.
Students reflect on their CAS experiences and provide evidence in their CAS portfolios of achieving the seven learning outcomes.
CAS continues regularly for at least 18 months with a reasonable balance between creativity, activity, and service.
All CAS students are expected to maintain and complete a CAS portfolio which is a collection of evidence and reflections on CAS experiences.
The student CAS portfolio provides evidence of achievement of each CAS learning outcome. Students engage in CAS experiences involving one or more of the three CAS strands.
A CAS experience can be a single event or may be an extended series of events.
Students undertake a CAS project of at least one month’s duration that challenges students to show initiative, demonstrate perseverance, and develop skills such as collaboration, problem-solving, and decision-making.
The CAS project can address any single strand of CAS, or combine two or all three strands.
CAS emphasizes reflection which enhances students’ learning and growth by allowing students to explore ideas, skills, strengths, limitations and areas for further development and consider how they may use prior learning in new contexts.

All students are required to:

Questions to ask when deciding on CAS activities:

Students are encouraged to not only find but create your own activities (this would clearly satisfy the creativity requirement).
Ultimately it is up to each student to choose and / or define their own CAS activities from the very broad array of existing endeavors that already exist at LHS, in our community, and in the U.S. and world at large. 
The key is for each student to get involved. If you need help, the CAS advisors will assist you with ideas and contacts---many of which are already listed on this website.
However as you learn more about CAS, you will probably realize that you already have been doing CAS all along.
The main difference simply may be that beginning summer (now) Junior year you will need to document your activities and accomplishments.