Praia da Foz do Arelho, 2500, Portugal
Great safe beach for kids on the sheltered lagoon side. Loads of space.
Even in November this is a place to be. You can't swim there during winter, but being barefoot on a sandy beach at the ocean is worthwile. Cafés are also nice. View spectacular. Definitely coming back.
Transparent blue wonderful water... The river meeting the ocean is a delight.