There is an epic canyon in the middle of San Francisco. One of the last free running trickles or creeks, Islais Creek, still charges down from the hills of Mt Davidson out to the bay and Third Street. Listen for the great horned owls and wander the grasslands blooming with soap root and lupines. Heres a map and other creatures to look for:
This is a scavenger hunt for kids in the hills:
This ones for them kids by the slow runnin creek:
Mission Azul 