Yes it is, you have to pay separately. If you pay online the price is a little cheaper.
Yes they are seperate. We paid $20 for parking across the park from the Aquarium.
Yes
Parking is separate. It cost $12 to park in the garage attached to the aquarium. You can pay there or buy a pass online with the aquarium tickets.
You generally donot find free parking in downtown / midtown are. So you probably will pay extra for parking
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