Well I thought we were looking for trasportation solutions or maybe .. gelato?
For the first question, remember you will find a free shuttle from harbour to station, for you and your luggage.
There is a reliable and accetably fast train service to/from Roma-Civitavecchia, is more hassle than a a shuttle of course, and it takes from 55min to 1h20min, but is 4.20€- info and timetable:www.trenitalia.it
A vital tip may be: chose the station depending on where are you staing in Rome. In fact, you might be able to avoid going to crowded Termini station where you have to walk from platform 23 (the further away) to the exit, about 1km.
For example if you stay near S. Pietro or in the Trastevere area, you have a local station, far more comfortable.
Now to the vital second question: where to find a good gelato. Well almost everywere.. but for those who want to go back and say "I had the unquestionable best"...you must go to San Crispino (Via Acaia - San Giovanni) Check: http://www.ilgelatodisancrispino.it/ It is widely recognized as the top in Rome, possibly in Italy, it is more expensive but a sensorial experience, let me know if you tried
Pica (via della Seggiola - Campo de fiori)
Tony (viale dei Colli Portuensi - Monteverde Nuovo)
Gracchi (via dei Gracchi - Prati)
Keep away from tourist ice cream like Blue ice, many spread around town!
When we came back from our Rome tour, we saw that the ship was docked next to the replica/faux lighthouse.
Fondest memory: Date after World War II. Approx. 20 m (66 ft) round stone tower.
In 108 AD, the Roman Emperor Trajan built two lighthouses at Centumcellae, now Civitavecchia. In 1616, Pope Pius V built a new lighthouse on the foundation of one of the Roam towers, and in 1860 Pope Leo IX had a second-order lantern installed on the tower.
The lighthouse was largely destroyed during World War II, and after the war a new tower was built as a historic landmark. However, the replica is much more slender and does not have the stepped form of the historic lighthouse. Located on the old waterfront of Civitavecchia, about 50 km (30 mi) northwest of Rome. Site open, tower closed.