A relaxing half day
A collective bike ride along the Appia Antica road: the starting point is very near to FAO and there one can also rent bicycles - electric or standard. That way, one could have a ride of few hours right after the lunch on day two (from 15:00 to 17:30, if possible from 14:00hrs).
The Appia Antica park is a spectacular site, less known by tourists and suitable for a relaxed bicycle ride.
You can find more info at the link below: