If there's anything that I feel was the highlight of our Manila Ocean Park visit, it was the Aquatica musical fountain show. It was a 25-30 minute spectacular mix of light, water and music/sound, making for an awesome show for the whole family. It costs P250 (weekdays) or 300 (weekends, holidays) per ticket.
At the time of our visit, they had a P99/ticket promo if you signed up at their website - a huge discount if you ask me. It would have cost us quite a sum had it not been for the promo that we were fortunate to take advantage of. Because of that, even the extended family with nephew, niece and nannies were with us to watch. LOL.
For those who have seen Sentosa's Songs of the Sea, Aquatica is very much like it for a fraction of the cost (even without the promo tickets). Or it's like a more animated version of the complimentary Bellagio musical fountain show, but you would have to be in Las Vegas for this. And that's another story.