Slow things down at Colle Oppio Park. Sit down with a book or lie on the grass to rest for a while.
You'll be spoiled for sightseeing choice when visiting Rome City Centre. Colle Oppio Park is a great place to kick off here, but there are plenty of other worthy attractions to enjoy. St. Peter's Basilica, Roman Forum, and Piazza Navona are close to the recreation and green space and and will cap off your day nicely.