Praia da Califórnia

You anchor off this gorgeous stretch of sand sitting right at the heart of Sesimbra, split in two by a 17th-century fort that juts out into the bay. The water is calm and clear, great for snorkeling, and the beach itself is famously well-kept with a bar and restaurant ashore. The backdrop of Arrábida National Park framing the whole scene makes it one of those spots you won't forget.