Cascais (kush-kaish) has rocketed from sleepy fishing village to much-loved summertime playground of wave-frolicking lisboêtas ever since King Luís I went for a dip in 1870. Its trio of golden bays attracts sun-worshipping holidaymakers, who come to splash in the ice-cold Atlantic. Don’t expect to get much sand to yourself at the weekend, though.
There’s plenty of post-beach life in the European Youth Capital 2018, too, with winding lanes leading to small museums, cool gardens, a shiny marina and a pedestrianised old town dotted with designer boutiques and alfresco fish restaurants. After dark, lively bars fuel the party. There's also great surfing at Praia do Guincho, 9km northwest, and running or cycling along the shoreline path.