I chatted first to Osmaro via Whatsapp. I explained what I like to see and he put things in a perfect order for me and my sister.
Unfortunatley, Joya de Ceren was closed to the tourists on that day (for an unknown period of time actually), but made a tour to San Andreas, El Boqueron, Museo del Arte and San Salvador old town.
I recommend to visit the museum as it has many original paintings that obviously cannot be found in Europe or USA. There is a lot of dedication to shed light onto the Martinez regime, i.e. many paintings are inspired by the dark side of that time. Specifically for us, Osmaro found the painting of our uncle, Kamilo Minero.
He knows so many things and does not get bored of talking and answering questions.
San Salvador city was not scary at all, instead we enjoyed walking around the old town. My favorite highlight is the Rosario Church, that is very beautiful inside. From inside it reminded me Sagrada Familia in Barcelona.
If you are in Latin America - book your tours. Osmaro will help you :)