The port of Cruz for Dubrovnik has plenty to do with shops, cafe''s bars or there is a local bus that serves Dubrovnik for about 3 euro and has a frequent service, takes about 30 minutes. Or, you can walk (about 30 mins' to the La pad area for a very nice beach but can be crowded in season!
Nothing here and you will need to get a water bus into Venice..about 20 minutes or, just a short walk, a newly built 'people carrier' railway...rather like the ones at airports which one stop, 3 minutes, drops you at the end of the Grand canal...all for just 1 euro!
Port is outside Rome Civitavecchia. There is a train stn' and normally, a shuttle drops you off, a short walk takes you to the station..About 20 minutes train ride you can alight at station St Pedro...right beside the Vatican!
This is a tender for disembarkation...it can be easy or made difficult depending on the ships organization..having said that, a lovely picture postcard port and from the rail station you can visit Nice or Monte Carlo.