The Blue Streak was built from scratch. Arnolds Park in Iowa is the oldest park operateing west of the Mississippi. Nobody knew that one, did they? Knotts was there since the 1930's, but didn't do the ride thing until after WWII. If you go to IAAPA, the Knotts family and the Koch family will argue (friendly) over who was the first themer. Way before Disneyland.
Cedar Point never closed. Neither technically did Conneaut Lake. The 2 seasons the amusements did not run, the campground and marina was still open, therefore revenue was created. Technically.