Lie on the grass and soak up the lovely surroundings at Parco Celio. After a long day exploring the sights, it's a wonderful place to take a breather.
When you've finished at this Rome Historic Centre recreation and green space, why not check out St. Peter's Basilica, Roman Forum, and Piazza Navona? They're not too far from Parco Celio and also a favorite with many travelers.