Flying to San Sebastián Spain for 4nts then on to Porto for 2nts and joining a tour in Lisbon to see more Sintra and on to southern Spain and Morrocco.
Need suggestions for San Sebastián and what to see in and around Lisbon and Porto.
Have you bought Rick Steves’ Portugal book? You’ll find lots of detailed info on Lisbon and Porto in it, including descriptions of self-guided walks. If you don’t want to purchase the book, try your local library.
Initially, I always google “48 hours in XXX” which will produce many articles giving you some starting points, as you haven’t given us any clues as to what interests you. One and a half days after travel in Lisbon and Porto isn’t very long.
Personally, I would have reduced the time in San Sebastián, but you must have had a reason for booking this division of your time. You could easily fill 4 days in Lisbon.