The Coconut Snow was originally a Hawaiian product, but was later bought by a southern California company that went belly up. While you might find a can on eBay, it would be decades old and not recommended. My recollection is that it was made from freeze-dried coconut, sugar, dry milk solids, and various other flavors, but wow did it make a great pina colada/chi chi.
Sorry, not Oahu… Kona Plantation was a predominantly outdoor resort on the Kona coast of Hawaii (near the black sand beach). Grass roofed, opened screened huts, and outdoor bar/pool. My first visit was at the age of 18, which in Hawaii means I could hit up the local bar!
Pretty sure its prime location has been replaced by big bucks development.