Last swim of the year at Praia de Caxias on the 31st Dec.
The closest real beach to the centre of Lisbon is found just over 15 minutes away, by Forte de São Bruno, a 17th-century star-shaped fortress. There are bigger and better beaches further down the coast, so this wouldn’t be among the most recommended beaches in the region, but its proximity to the capital means you can admire landmarks as you get your feet wet.