Gambling normally only takes place while the ship is in international waters, cruise lines that sail from U.S. ports also adhere to the rules set out by the Cruise Lines International Association.
Bowling is a past time that's been enjoyed for generations. One of the first places in the country where you could bowl is still open to this day in Minneapolis, Minnesota.
The production of this secret weapon was so important to the Allied war effort, the security of the project rivaled that of the Manhattan Project in New York, involving the OSS, the FBI, and the US Navy.