UCSF Summer Picnic at Six Flags Discovery Kingdom 2018 UCSF Summer Picnic at Six Flags Discovery Kingdom 2018 UCSF Summer Picnic at Six Flags Discovery Kingdom 2018 UCSF Summer Picnic at Six Flags Discovery Kingdom 2018 UCSF Summer Picnic at Six Flags Discovery Kingdom 2018 UCSF Summer Picnic at Six Flags Discovery Kingdom 2018 UCSF Summer Picnic at Six Flags Discovery Kingdom 2018 UCSF Summer Picnic at Six Flags Discovery Kingdom 2018