Help for intended CS major, what summer and other activities? Calif based

Since @NCalRent has mentioned WUE schools, allow me to make a plug for Northern Arizona University in Flagstaff, AZ. NAU gets lots of CA kids who are shut out of the UC’s and are looking for a residential college experience. NAU also offers both WUE discounts and merit aid to OOS students. https://nau.edu/office-of-scholarships-and-financial-aid/freshman-merit-based-tuition-scholarships/ (Note that ASU and U of AZ do not offer WUE discounts for CS majors but do offer merit aid to OOS students.) When my kid visited NAU I wrote a review of our visit: Parents of the HS Class of 2019 - 3.0 to 3.4 GPA - #882 by Corinthian