Beach types
Surface, activities and access rules are different questions, so each type here states exactly what qualifies a beach for it.

Sandy beaches
111 beaches · Sand underfoot

Pebble & rock beaches
27 beaches · Shingle, pebbles, rock

Surfing beaches
43 beaches · Waves with a board

Snorkeling beaches
16 beaches · Reefs and clear water

Diving beaches
6 beaches · Dive access from shore

Scenic coves
17 beaches · Sheltered inlets

Lake & freshwater beaches
22 beaches · Lake and river shores

Naturist beaches
11 beaches · Clothing-optional areas

Blue Flag mentioned
24 beaches · Award cited in sources