It's a short journey to the highest point of Janiculum. Here you can breathe in the fresh air and admire the views of the surrounding area.
You'll have sightseeing choices galore when spending time in Rome Historic Centre. Janiculum is a good place to start here, but there are many other worthy places to experience. St. Peter's Basilica, Roman Forum, and Piazza Navona are not far from the naturally raised area of land and will round out your day nicely.