I'll be honest. I am not usually a fan of the zoo.
For one, I am not much of an animal lover. don't hate. I must have gotten burnt out from childhood. We had all kinds of mangy creatures, usually under-cared for, and almost always could later be found on the family dinner table.
Not only that, the zoo just doesn't hold much fascination for me. All the times we've been to the San Diego zoo, I usually get all moody that we have to walk up and down so many hills just to see empty cages because the animals are sleeping or feeding.
But, kids can change a lot of things. When my kids get excited, the energy is somehow transferred to me and any activity becomes a fun one (even when you drove 16 hours the night before and you really just want to snooze).
I must say, the Portland Zoo was a delight. Charming (which is always a plus), shady, not too overwhelming, and we could enjoy the company of good friends.
One highlight for me was capturing everyone getting heckled by the goats.