I can help with the history of the Pirates of the Caribbean and Caribbean Plaza, if you'd like. I found out that in the original 1967 plans for the Florida Park, they did include the Pirates of the Caribbean. It was omitted from the plans for the Park by December 1967. However, it was greenlit for the Magic Kingdom in December 1971, two months after WDW opened. It was designed between April and August 1972 with construction beginning that September. The show building was erected during the late months of 1972 with the entrance building and Caribbean Plaza following behind. By Summer 1973, the construction had included not only the show building's interior (which apparently took months), but the entrance building and part of Caribbean Plaza. Now Caribbean Plaza (referring most to the north side of the complex with the shops, restaurant, and bandstand) opened in full in April 1974. The Pirates ride, along with the House of Treasure (which was opened for a few days that month, probably for the press), opened in December 1973. The exit plaza (which is between the restrooms, old Caribbean Arcade, exit doors from the Pirates, and the House of Treasure) was more of an atmospheric experience than a strict merchandising operation (which is the case nowadays).
The Pirates ride itself had many operational difficulties when it first opened with the ride system (one problem that hasn't gone away, it seems).
Here is a table of opening dates for Pirates and Caribbean Plaza:
Late November-about December 14, 1973: the previews for cast members and other ride testers (likely from WED or MAPO)
December 15-17, 1973: Opening weekend with press previews on the 15th and 16th and guests being allowed to ride for the first time. There is a debate over the dates because some of the local newspapers have shared different details on when it happened. The House of Treasure was briefly opened at this time, but it was not clear as to the extent of merchandise sold during those few days or so. It would remain closed until early 1974.
Late February 1974: The House of Treasure was opened fully.
April 1974: The entirety of the north side of Caribbean Plaza (which included everything from the bandstand to the Golden Galleon shop on the border with Frontierland) opened up.
Between September and December 1974: The Caribbean Arcade had opened in an alcove adjoining the "exit plaza".