Six mountain bikers on the various trails this time.
Lower Historic: 1 thru 8
Along the road on the walkway: 9
North Ridge Trail ahead: 10
Down from the summit (pic 11), a shortcut to the upper Historic on the upper West Ridge. Easier to climb than to descend.
West Ridge to Historic: 12 thru 18
From the upper Historic, a right turn, round to the north on the Historic and out to the road: 19 thru 24
Down the 136 or so steps to the foot of Medical Center Way behind the medical buildings, and out again to Parnassus: last one.