I always visit this place on my visits to Manila, ...

I always visit this place on my visits to Manila, it's definitely very old but still keeps up with some pretty cool attractions, such as the walk in glass tunnel where you can see many of the large inhabitants in the tank. They even have a penguin exhibit where you can pay a small fee to hand feed. It's very adorable and fun for the family, more fun though is being able to touch a manta ray in the pool near the performance stage. Be sure to look at klook for deals though, you'll save a lot on the entrance fee.