To make a Puerto Rican style Piña Colada you'll need a sticky goo called 'cream of coconut', not to be confused with coconut cream. Cream of coconut is made by mixing coconut juice, sugar, emulsifier, cellulose, thickeners, citric acid and salt and is usually sold in 15oz/425ml cans which make 14 to 25 drinks depending on how sweet you like your Piña Coladas. Once opened the can's contents should be stored in a refrigerator: this may thicken the product, so gentle warming may be required prior to use.
The original brand of cream of coconut is Coco Lopez which was developed in 1948 in Puerto Rico by Don Ramón Lopez-Irizarry - hence the Puerto Rican connection and the believable 1952 date for the creation of the modern day Piña Colada at the Caribe Hilton Hotel. Some say the drink did not acquire its name until the 1960s - perhaps that's where Ramón Portas Mingot and the Barrachina restaurant come into play.
It seems there's a set day in the calendar to celebrate most things and readers may want to mark their diaries with National Piña Colada Day which is celebrated each 10th July on the island of Puerto Rico and to a lesser degree across the USA.