With its sunny weather year-round, Portugal is the ideal destination for an outdoors adventure holiday. And the options to explore it are endless! Whether you are looking to discover the country’s most popular sites or you want to take a detour and head off the beaten path, Portugal boasts a network of well-marked long-distance trails (called Grande Rotas) to take you exactly where you want to go. From the steep mountains to the deep river valleys and the breezy Atlantic Coast, our four favorite walks below will take you through some of Portugal’s most stunning landscapes and fascinating historical sites.