From SF Rec and Park eNews:
Drop-in rock climbing is back at the Glen Canyon Recreation Center rock wall from now until March! We have hour-long sessions that will go from 6 to 8 p.m. on Tuesdays, 4 to 8 p.m. on Wednesdays and 10 a.m. to noon/1:30 to 4:30 p.m.on Saturdays! Limit six climbers per session. For more information, call the Glen Canyon Recreation Center at (415) 239-4007.