Looking for ideas for our first day and 1/2 in Rome. We arrive on a Wed. morning, and have tours scheduled for the Vatican, St .Peter's, Forum and Colosseum Fri. and Sat. My husband is a bit of a cautious traveler and so I am looking for something we could do on our own that is somewhat easy. We are staying near the Borghese Gallery, but I would love to see the Pantheon, Trevi Fountain, & Piazza Navona, but am open to other ideas. Not sure how great he would feel about using the bus system. We aren't opposed to walking to get to places, but I just can't tell if that is really doable and safe. I want this to be fun for both of us so he'll want to continue to see the world!