Bus from Collserola or from plaça Catalunya in front of El Corte Ingles (price: 1,90 one-way), the bus is named the Tibo-bus.

Tibidabo is a mountain at the west-side of Barcelona. On the top of the mountain there is a monastery and a little theme-park. (but the theme-park is not too interesting, except for little kids) In the monastery you can walk up and for the last part you have to take an elevator which will cost you 1,50 Euro, and the view is definitely worth it!!!

This area is also very nice if you want to take a walk and get some fresh air.