You won't find much seclusion on this coast, but if you want easy access to restaurants, cafes and public transportation, join the crowds at the vast beaches of Caparica. They are popular and lively in the summer, even at night, when most bars stay open until late with music and dancing.
Buses depart from Lisbon's Praça de Espanha bus terminal to Caparica town, which is a five minute walk from the beach.
Capirica has a train that runs all the way down this very very long beach in summer (June to August-ish). It gets you away from all those crowds at the top of the beach. Stop 16 or 17 is the nudist section.
That bus from Praça de Espanha only runs in the summer. During the rest of the year you must cross the river by ferry from Belém to Trafaria, then take a No 129 bus.Send your feedback or queries to been.there@guardian.co.uk
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