See the best of Rome on a 4 hour tour which includes stops at the most famous sites as well as secret “off the beaten track” sites. There will be plenty of stops to get off the bike for water or to go inside.
See the outside of most of the sites passing through squares filled with daily markets (Christmas especially). Go inside a few selected sites such as the Pantheon, Church of St. Ignatious, and Palazzo Mattei near the Jewish Ghetto.
Take time away from the bikes to go inside the sites or have a coffee and drink from the water fountains.