Being Floridian I have a tendency to be occasionally pretentious about my beaches. I can safely say New Zealand has some of the best beaches in the world, easily competing against the best beaches in Florida.
The vistas are beautiful and the sand is smoothing. The ocean water may possibly be even cleaner than Florida’s (Jacksonville, FL’s beach is the only dirty beach in my experience).
One thing New Zealand has is the backdrop of the picturesque mountains, along with the unique formations (that you may or may not climb at your own will) closer to the tide of the water.