Family of 4 with one day in Barcelona.
Can someone recommend a tour company you have used - we would need pick up at pier from cruise and return to airport.
Give www.maribelsguide.com a try.
When I was therem I did not use a tour company, but did use the Tour bus found at the city centre. Take the metro to the Las Ramblas area, and there's the "hop off/hop on" busses you can take. There's multiple routes (red, green and blue line) but if you have 1 day, select the red(?) line. That will take you to the more popular spots like the Sacred Family church, etc.