Praia Santa Marta
Best at low tide; perfect for swimming in summer.
This beach is beautiful located with a great view to the lighthous and Casa de Santa Maria. At low tide you can walk very easiely into the refreshing sea. In August the temperature is around 25-30 degrees. If you stay in Lisbon you can take the train to Estoril or Cascais. We always like to walk from Estoril along the promenade with several beaches. Santa Marta is more hidden and a longer walk.