You could do it on one day but it would be pushing it & depends on how long you spend going through & the age of the people or children going with you. Also depending on the weather forecast.
The aquarium is about a two hour tour. The zoo could be a half day but easily an all day affair
I would recommend to visit on different dates. They're both quite far apart. My recommendation is to buy the The Aquarium/Zoo combo ticket or the Experience. Both are valid for a year from the date of purchase until used so you can enjoy both attractions.
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