Relaxing things to do in winter in Barcelona:
1) visit a teteria (a spanish/arab teahouse)
2) visit a Steambath or go floating
3) get a massage
4) go to Cinema/rent DVD

Finally some sun! Plenty of people rushed to the beasch of Casteldellfels, just outside of Barcelona, to catch some sun and have lunch outside.
Castelldelfels can be reached by train or bus roughly within 20 min from Barcelona.

Surfing in Barcelona is best in autumn. These guys brought their surfboards to Barceloneta, the first beach in Barcelona which you can easily reach by Metro.

Close to the airport of Barcelona lies the Llobregat Delta. Two lagoons make up a nature reserve, which despite constant airport traffic attracts plenty of birds. A walk to the nearby beach is worth wile. Take the highway to Casteldelfells or the bus 95 and get out at ‘El Camping del Toro’.