looks like your trip on Jade will take you to Rome, Naples, Athens, Istanbul and Ephesus, Monte Carlo, Barcelona, Sardinia. They don't have hop on and off buses in these locations. However, in Rome you will want to visit the coliseum, the forum, Vatican. In Naples you can visit the Pompeii ruins, Istanbul has the blue mosque,and grand bazaar, Ephesus has the ancient ruins that date to the Apostle Paul, Monte Carlo has the big casino, Sardinia is an island off the coast of italy, not too much there, and Barcelona has some great architecture, and cathedrals.
12 days until I leave for my two week Retirement Cruise