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S.E.A. Aquarium

I suggest buying your tickets online in advance. It saves you from the long queues at the entrance, trust me, I wasted about 30 mins just waiting around.

If you have kids, definitely check out the interactive exhibits. They loved it, and it made the visit more fun for all of us. I think you'll enjoy it too.
My advice is to visit on a weekday, especially late mornings around 10-11 AM. The crowd is way lesser and you can enjoy the exhibits more peacefully.
Marine Life Park

My advice is to visit the Open Ocean exhibit around 2 PM. I found it less crowded and had a better chance to see the manta rays up close.

I suggest you buy your tickets online before you go, it saved me a bunch of time waiting in line! Plus, there are sometimes discounts if you book in advance.