Most of the animals in the park are pretty accustomed to the humans.  Provided we remain a reasonable distance away, they are comfortable getting on with their lives.  Get too close, and they will be spooked.  The exception to this rule is red-winged blackbirds.  They really seem to be quite blasé about the humans.  Stand on the boardwalks and they might come and land on the handrail next to you and wander up alongside you.  Sudden movements might scare them, but steady movements won’t phase them at all.  While watching other wildlife, you can almost not realize that they are there.  I find my phone is the best option for getting images because they are too close for the regular set up.