Look on the ground, just off the sidewalk on the right side a bit before the tree.
A closer look, can you tell yet?
Now you can see the nesting bird, right?
I was able to get very close and she (I presume) didn't move a bit.
Later in the day we came back and this is what we saw:
The mother bird and the father, who's also in the area and sometimes does a decoy act sort of on his side with his wing up and squawking like he's injured, were both around, and not very upset - I think they were feeding. The next time we walked by the mom was back on the nest.