Around 30 dollars
29.99 per person. Plus 1free movie
For the aquarium alone, it's $29.95 plus tax. This also includes one of their IMAX features.
Not sure about just the aquarium but it was $87 for 2 tickets which included the zoo, insect institute as well as the aquarium. All 3 were worth the price. You can get to them on the trolley. Day ticket $3.
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