Yesterday I went out to Belem, a suburb about 30 minutes by trolley or bus.
I went to the Monastery of Jeronimos – a huge church and monastery that stretches 300 yards along the street. Very beautiful but unfortunately a little stressful because I encountered the dreaded tour bus groups with their silly selfie sticks!
There is also the Age of Discovery monument, which unfortunately is being restored so it was shrouded.
There are tons of museums but it was such a lovely day I just walked along the waterfront and then escaped.