things to do in barcelona/spain

[deathpotato]

Hey, I'm the friend from the OP - we're going to be staying at kabul hostel in plaza real for the first week, then moving to a hotel (haven't decided where yet). Good suggestions so far, I was wondering how much spanish we should know when we get there. Will we be able to do ok by using mostly english and knowing a few key spanish phrases (bathroom, etc)?