We plan to take an early train from Orvieto (7:30 arriving 8:26, so we'll drop our bags at our hotel and then have the rest of the day for sightseeing, gelato, and a good meal) on October 3, staying two nights at a small hotel between the train station and the Colosseum, Hotel Rosetta. Since our time is so limited, I thought maybe the experts here could help me with an itinerary and walking or transit instructions for the best use of time.
I've read that it is best to tour the Vatican Museums and St. Peter's Basilica in the afternoon after the group tours begin to clear. Is this still true? If so, perhaps we should plan to go there this afternoon. And this evening? My guidebooks say the Ponte Sant 'Angelo is beautiful at night, along with the Piazza Navona, but maybe we should go there after we drop our luggage, then head for the Vatican.
On the 4th, our main focus would be the Colosseum (we'd like to do the Underground tour), Forum and nearby sights. We'd like to see the Pantheon. If we have time on one of our days, I think we'd find Le Domus Romane di Palazzo Valentini very interesting.
Of course we must find time to visit the Trevi fountain to toss our coins to insure we'll return to Rome one day to see the sights we must pass by this time.
Suggestions and tips for constructing our tour, walking when possible, public transit or taxi when necessary, would be most appreciated. Also, if you've come across a favorite place to eat while out sightseeing, I'd love some suggestions there, too.