In the 1950's and 1960's, we would frequently visit Knott's when it consisted only of the restaurant and the ghost town. In the 1970's, inside a replica of Independence Hall, there was a bookstore that specialized in conservative books. They also rented out films to conservative groups.
Since it became a full-fledged amusement park, I usually only go there for the restaurant--you don't have to pay admission into the park to eat there.