The area along T1, T2, T3 (T is Tram) is not popular for tourists. But this area is good to relax. A fewer people. And can see local people's life.
An area around the "Francesc Macia" station is an office area where is edge of T1, T2, T3. An area around that "Zona Universitaria" (University Zone) station is a university, institution area. The train line L9 from the station is good to go to airport.