Family-friendly snorkelling coves in Portugal with clear turquoise water?

[user1497077033]

Does anyone know of any dreamy turquoise coves for snorkelling in Portugal with kids similar to Majorcan coves? I know the sea is the Atlantic so it will be different.

When I went to Portugal many years ago, the sea was cold, very cold.

And lots of waves.

Not great for snorkelling IMHO