I have been to Rome twice and my last visit over three to fours year ago. Things might have change so it hard for me to recommended something that might not be true. Also you been there and have probably visited all the popular attractions.
If you are looking for the latest/greatest information about Rome, I strongly recommend you go over to the
Slow Traveler website . Their messages boards have a very popular Italy discussions. I found Madridman's website from the Slow Traveler message board. You will find information from people that have just returned from Rome or will get advice from people that live there.
Rome for me is a unique city such that I can always revisit exactly what I did my last visit. Revisiting Saint Peter’s Church and it square, the Capitoline Museum, the Pantheon, the Colosseum, Sistine Chapel, Vatican Museums, Galleria Borghese, climb to the top to Saint Peter’s Basilica, walk the streets of Rome and it was still be breathtaking fun for me.
My last visit I did get a chance to visit the Galleria Borghese. I was knocked over by the beautiful artwork in this small gallery. You need to have reservations to go. If you have already booked your hotel, they should be able to make your reservations. I highly recommended it if you have not been there.
Lastly and I proud to say, I been to Rome twice and know I will be going again sometime in my lifetime. I never once have thrown a coin over my shoulder at Trevi Fountain and never will!
Have fun in Rome!
Bill