4 -rrb- in san francisco is airing reruns of `` home turf , '' a magazine show for teens . ; segments on `` kids ' clubhouse `` have included performances by a local teen-ager who does indian dances ; the work of a 10-year-old musician who wrote his first song at age 7 ; field trips to the california state train museum in sacramento and the ghirardelli chocolate factory in san francisco ; interviews with assemblywoman delaine eastin , d - fremont , and former giants catcher gary carter .