Welcome DisneyFN420!
We were in Rome in December and I can let you know that although it is a city, it quite a compact one. We are not bothering with any of the
DCL excursions as they do not seem value for money. I'm told that the railway station is near to the port and it only takes 30 to 45 mins to get into the main Rome station (Termini). The cost should also only be around €10 return. From the Termini station you can use the basic underground system (which seems perfectly safe) to get to most of the attractions. The one main attraction we missed in December was the Sistine Chapel because we went in the afternoon and I believe they only let so many visitors in each day, so we missed out. We will therefore be making this our number one priority.
A recomendation I have made in an earlier posting is to do the hop on hop off tour. For around €20 Euros you can get a bus pass that will take you round the majority of the main attractions and you will have time to spend at each one if you want.
The Trevi fountain is on the bus tour and is in easy walking distance of the Spanish steps, the Pantheon and Piazza Venezia. Once you get to Piazza Venezia you can walk down in to the the Forum, which is an amazing site AND free. The Trevi fountain is beautiful and not at all in an area like you would imagine. It is down some side streets and once you turn the corner and see it tagged on to the back of a building it will take your breathe away.
If you do the bus tour you will also get to see Circus Maximus (not much to see but you can imagine) and it will also take you to attractions that are often missed if you try to do it yourself like Piazza Navona (another lovely square) and various other sites. You also go past the area where Brutus killed Julius Ceasar. Again, we would not have found this if we had not done the tour.
Sounds like I'm selling tickets but I'm not. Just good value for money and with limited time, this is probably the best option to take in the most sites.
We can't wait to go back there!!!!