The story
Pacific Ocean Park was a joint venture between CBS and Santa Anita Park. It opened on Saturday, July 28, 1958, with an attendance of 20,000. The next day, it drew 37,262, outperforming Disneyland's attendance that day. Admission was 90 cents for adults, which included access to the park and certain exhibits. It was locally known by the acronym POP ("pee-oh-pee"). It was also marketed as "Pay One Price", though other rides and attractions were on a pay-per-use basis.
Like Disneyland, it found corporate sponsors to share the expense of some exhibits. Six of the pier's original attractions were incorporated into the new park, including the Sea Serpent roller coaster, the antique Looff carousel, the Toonerville Fun House, the Glass House and the twin diving bells.
From Wikipedia’s article on Pacific Ocean Park, shared under CC BY-SA 4.0.3
