I would not attempt to put anyone off going to Barcelona, but the pickpocket problem there is massive. The police dont seem interested, as they know the tourist will only be around for a short stay. I was there in November, and had my wallet dipped on the Metro. A mate of mine pointed out that the 4 men and 1 woman, who entered our carriage, then got off at next stop, were a pickpocket team. I checked my pocket and lo and behold, wallet was gone. I ran after the ring leader, and to cut a long story short, got it back. I was very lucky though, that a mate made me aware. Everything was in that wallet, and it was in my front trouser pocket. Did not feel a thing. La Ramblas is ok during the day, but at night, it is a complete dive, to be avoided. It is a very big city, and the transport system is good. The castle mentioned is worth a visit. The Nou Camp is worth a visit, but dont buy tickets in advance off online agencies, go to the ticket office when you settle in to the City. The Metro will take you there from the centre. Ticket prices on the internet, are usually 4 times the actual price at least, and are a rip off. The non pickpocketing people of Barcelona, are very laid back, and pleasant enough. The Spring is a good time to go, and the weather should be ok. Hope you enjoy your trip, but be vigilant.