I am starting to research a one day tour in Rome for B2B. Need to be picked up at ship and taken back. Any recommendations? It will probably be 4, maybe a couple more, and I would want to work with them to customize what we do. The day trip is on a Sunday, so the Vatican will be closed, so we don't have to worry about that. Our friends haven't been to Rome, so I sort of know what we want to take them to see, but in looking at the possible ships tours, didn't see anything that was quite what I think we might want. We don't have to see everything, just the highlights and a little walking around on our own. I'm not real comfortable taking the train transfer, as I know thats an option of possible tours, but we'd prefer not to do that.
Has anyone done this before? Taken a private tour to/from the ship in a one day stop?

Thanks.