Barcelona 4 days, tight budget and relaxed holiday | Spain

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hi am in barcelona for 4 days in early march. have a bunch of questions: - whats the weather like and what would i need to pack? - how can i save money on food and drinks? - what kind of day trips can i take outside barcelona? pls give me details and also how much it would cost me. - What are the spots to see and things to do in barcelona? - can i get away with speaking english? or would i need to habla espanol? ;-) - what are the romantic spots to visit in and around barcelona? i know thats a whole bunch of questions that might take pages of answers but pls do help. thanks.