In 1958, a group of investors known as "Pot O' Gold, Inc." built a concession area that included: a snack bar, cocktail bar, and a building named "Happyland" containing 185 slot machines. At that time, Charles Co. was the only jurisdiction close to the District that allowed gambling. Many children's amusements existed: a swimming pool, ice-rink, roller coaster, ferris wheel, (c. 1905) carousel house with merry-go-round, shooting gallery, "frontier" railroad, and many other "kiddie" rides and arcades.
As new real estate development along the Potomac became visible from Mount Vernon, lobbying by private citizens and....(goes on to talk about the chain of events leading to the government buying the park because it was 'unsightly'...)