Hi, Marcella! You can find information on all available admission offers here: https://www.portdiscovery.org/hours-admission-discounts. Typical General Admission tickets are $21.95/person for all ages one and older; there are some things like $5 Community Days and PlayMaker Tickets that are available as well; you can find that info on the link provided.
For a family of six you can buy a membership for $186.50 which will allow you to go back as much as you want for a year they also have a deal where if you receive Maryland food stamps I believe it's $3 a person up to five people
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