The features we enjoyed (some a second or a third time, now) were:
The Aviary - lots of colorful and different-looking birds; we also liked the Flamingo Pond
Ocean Theater - had to go up the super-long escalator to get here. We watched a 30-minute show featuring seals and dolphins
Shark Aquarium - our favorites were the graceful and peaceful stingray, as well as the swordfish
Atoll Reef - lots of interesting fish though the place seems smaller now or are we all just getting tired and older?
Pacific Pier - you can watch seals here and even have feeding and photo opportunities
Cable Car and Ocean Park Tower
The Giant Panda Habitat -where we saw pandas for the very first time
Butterfly House - plenty of winged friends though not too much variety in kind
Whiskers Theater - watched some seals do the ring toss, dance, brush their teeth; pretty interesting tricks
On top of all these, Paulo and Adi enjoyed the Merry Go Round and the Train
Ride. The kids had so much fun it looks like we'll have to return to Ocean
Park again another time.