Down a few steps onto a short bricked walk that took me nearly to the east end of the Ecology Trail, its trailhead just behind Inn of the Presidio.
About to continue down the 37 or so familiar concrete steps (pics two and three: THENs) to the street below (Barnard), was surprised to see a replacement stairway. It's fully walkable, though the area was still being worked on (pics 4 through 7). It's got approximately the same number of steps, now wide and wooden with black railings. Main Post's Funston/Moraga/Hardie down to Barnard.
Continued downhill to Quarry and Fernandez, then up again (8th pic: new stairway in distance) to the dead-end of residential Quarry Road where I once again hit the Ecology Trail, this time out in the open, below Inspiration Point Overlook and just a few yards from the top of El Polin Spring's newer, west, stairway (69 steps, pics 9, 10) down to the little valley's picnic area.
Up again on the newer eastside accessible ramp, passing the covered-over older stairway (pic 11). This connector trail is nice and green now, a huge difference from when it first opened; "my" willow tree looks quite happy (pics 12, 13, 14). 15th pic: El Polin Spring from a trail above.
Up through the sand between Presidio Blvd. and Arguello, came out near Julius Kahn Park (16th pic: a view east) where there's an opening in the Presidio Wall at Pacific and Spruce (last pic). Once out of the park, Spruce between Jackson and Washington was good 'n steep.