Botànic Bar Cafè is a great place for a quiet drink with mates (in the back garden) or a loud drink with strangers (inside). Central to all the action and does food too!
Parc Ciutadella is the most popular park in the centre of Barcelona. It's a beautiful space and even has a lake with rowing boats for hire. Great for all ages and tastes.
El Berro is a great choice of restaurant. It's in the centre of the gay scene. It has great food, a fun atmosphere, it's reasonably priced and it has unusually fast service!