All are well done and allow a great chance to view some pretty cool animals.  The penguins are fun to watch as you slowly pass right in front of them on a conveyor-type belt or as you watch them from a static platform raised about that.

The sea lions are also a great time.  Try to get there during a feeding opportunity so you can buy a few fish and toss them in to the comedic sea lion performers.  If you are a bit early or late for that, next door are the lorikeets--it's always a great time feeding those very colorful birds.