We did this cruise last April. You will love it! We were lucky enough to get the Viking excursion for Gaudi in Barcelona. It included going inside La Sagrada—absolutely a must. Nice, Eze, and Monte Carlo was a long day, and our tour person wasn’t very good, but the locations were great. We did the Catacombs/Vatican excursion in Rome and got tickets for the Museums/Sistine Chapel prior to the trip. That worked out nicely. Pompeii is a must. We did the included tour and the wall walk in Dubrovnik. Both were excellent. I would really recommend the Krka waterfall excursion in Split. It’s a bit of a drive, but the falls are incredible. We did the evening gondola ride in Venice—touristy but a great experience if you haven’t ever done it. We got tickets for St Marks and for the Doge’s Palace prior to the trip. That worked out very well.