The admission is 40$ for non residents excluding the 4D movie but taking a citypass gives you access to the movies too.Do remember that the dolphin and whale show there has separate tickets that are sold within the aquarium. Also parking is not free, it's 25$.
Yes, it's a good option...
Citipass is best option to get cheaper rates
Citipass is the best option! Also to avoid parking fees there is a metra station near the aquarium
If visit from out of state you may want to consider citipass
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