Thank you all. This was exactly the type info that I was looking for. We will be in Rome on Easter Sunday, so I am passing on this altogether. There are 3 others with me, and I think the coliseum tour will be perfect for them. I have been to Rome and Florence, so will do the Luca tour at that port. Croatia and Greece were the places I was most concerned, since I have never been to either country. What about Barcelona? We are doing the post-cruise extension. I know we have to do the La Sagrada Familia, but should we do it with a Viking excursion or one of the days on our own? What else would be a must see there? To me, Barcelona looks like it will be so much fun, don't want to waste any time on non-worthwhile things.