If you have the opportunity to visit Libson, it makes sense to take a few day trips if time permits and after a lot of discussion Sergio and I spent time visiting Cascais and Sintra. The two locations could not be more different but both were easily accessible by the Lisbon metro (30-40 minute rides) that cost about 5 €.
Cascais is a coastal town about 20 miles west of Lisbon that became a favorite destination of Portugal’s royal family in the late 1800s but is now an affluent suburb of Lisbon that is a popular vacation spot for both Portuguese and tourists. We spent our time walking through the small town and along the running / bike paths that hug the coastline and extend out from the town.
Sintra is another beautiful day trip from Lisbon probably best known for its many 19th-century romantic architectural monuments. We spent a day here when the temperature in Lisbon was close to 100°. Fortunately Sintra’s microclimate meant that we enjoyed a breeze and temperatures in the low to mid 80s, which was important because visiting Sintra = a leg workout.