Treat Civitavecchia and Rome as two different places
The ship is not in central Rome. Build the day around the port-to-city transfer first, then place the Vatican, Colosseum or historic center inside the remaining usable time.

A Rome cruise day succeeds or fails on the transfer plan. Start with the real distance and return margin, then decide what fits.
The ship is not in central Rome. Build the day around the port-to-city transfer first, then place the Vatican, Colosseum or historic center inside the remaining usable time.
For many cruise calls, one timed-entry interior plus a walkable outdoor circuit is more realistic than trying to force multiple ticketed landmarks into one day.
Return-to-ship margin matters because rail, road traffic and port shuttle steps can all add friction. The last hour should not depend on everything going perfectly.
Bon Voyage already maintains focused Civitavecchia-to-Rome and airport-to-port guides. This hub connects those decisions instead of repeating them.
Frederick can use this page as the current planning context, then connect live hotel or experience inventory when the traveler wants to compare options.