Museum space. Smithsonian has millions of things packed away in store rooms gathering dust. Get it out and show it off! Rotate exhibits every two years.

Far as I know, there's nothing as big as the National Air and Space museum for water. Lets have a genuine Maryland skipjack dock there for tours. Blue crab or oyster "farm" attached to the Aquarium, see their lifecycles live and inperson. Native plants and pollinators exhibit.