As part of our post NCL Epic TA 15 nights NY to Barcelona cruise, we did a half day tour to Montserrat and next morning, City Highlights for 1/2 day - visiting Park Guell (skip a line), Sagrada Família (outside - option for tour operator to reserve & obtain tickets in advance for us, optionally with small group discount) and other Gaudi structures.  Free pickup at cruise port and/or hotel and also dropoff at the end of the tour (we "concluded" our tour at La Ramblas) which was walking distan