We have a pretty good zoo in Portland. It's not the best, but the animals are well cared for and healthy. All year long I planned to visit. Plans to arrive early (before the stroller brigade) were made, cancelled and made again ... and then a baby elephant was born. Since then the crowds have been legendary and the thought of any quiet time vanished.
So, two days from the end of the year, the best I can do is the crowd-control vehicle near the gate.
Wait til next year!