Japanese School of San Diego
The school’s web site doesn’t tell you much - its located at http://www.sandiegojapaneseschool.com/index.htm and notes the location - market street which is again not very close for Carmel Valley residents.
But, this link tells you they teach 5th grade through adults - http://www.cajls.org/member_schools/san_diego/sanDiego.html and gives a little detail on the types of activities for children on the week-ends.

