Sitter Job in San Francisco, California

My son, Kazu, is four years old and attends preschool in the Richmond District of San Francisco. He is in school until 2:30. I am looking for a part time nanny/sitter that can pick Kazu up from school - bring him to the playground across the street, the library, or swimming lessons - and then bring him home to Potrero Hill around 4:30 pm -5:00 pm. You would need to use your own vehicle for transportation. Kazu is attending a Japanese preschool but is not fluent in the language. If you are fluent - that would be a bonus but not necessary. I am looking for someone who is comfortable with playing with Kazu at the playground and including his friends in playing games that promote positive social behaviors.