There is no standard cost. They ask for a $10 donation, but you won't be turned away if all you can give happens to be less. They want the aquarium to be accessible to all. As mentioned by Jose, there is a fee for parking as well.
On the beach you don't pay only the parking
Donation that your heart puts into account that for the aquarium to continue renovating money is needed.
If you pay
It's free, only parking is charged
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