For fine sand beaches, you will find some of the best are Koukanaries on Skiathos, Golden on Paros, and Paradise on Mykonos.
Koukanaries, Paradise, and Golden are the worst beaches there is. 
mnli hypothesis: Koukanaries, Paradise, and Golden are the worst beaches there is.  premise: For fine sand beaches, you will find some of the best are Koukanaries on Skiathos, Golden on Paros, and Paradise on Mykonos.