In one word: Family
GPS: From Fira head to the airport, then there are signs that will lead you to the organized part of Monolithos beach. If you take the bus it leaves you right in front of the beach.
Picture: A big, flat beach with dark sand and shallow waters.
Beach Life: Monolithos has plenty of sun-beds, lifeguard, playground and basketball and volleyball courts.
Crowd: Ideal for families and those wanting a beautiful, shallow beach to enjoy swimming.
Food/Drink: Taverns and a café right by the beach.
After beach: Monolithos is a great beach, you can swim and in the not organized parts, but it would be good to avoid the left side of the beach.