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All Halloween activities are included for the price of regular admission, which is $29.95 for adults, $14.95 for children 3-11, and $22.95 for seniors. Aquarium members get in free; their guests get 20% off.
The official website offers this description of the event:
"Discover the creatures lurking in the depths at Scarium of the Pacific—a spooktacular educational Halloween event for the whole family. Enjoy special Halloween programs, including the annual children’s costume contest, the creepy coloring contest, face painting, magic shows, underwater pumpkin carving, spooky storytelling, kooky crafts, eerie animals in the Great Hall, and much more."