We will be only briefly in Barcelona before our cruise on a Friday in early June (wanted more time, but flights didn't work out...).
We arrive from Munich at 11:45am (if all goes well!) (already time adjusted - we get there on Monday). I would prefer to grab lunch and then see the Sagrada Familia (and a tower climb) around 3:30 or 4... How are the crowds in later afternoon? We would book tickets in advance of course.
My other option would be to go first thing Saturday morning before boarding, but I was thinking we would just stroll around at La Boqueria and get some breakfast and then head down to the port. I'm not sure I want to deal with seeing the church that morning, unless it's a much better option...