Interesting fact: it's the world's smallest inhabited island.
This cute little island is located on the river between the two sides of Rome. On the Island is a couple of shops, church (Chiesa di San Bartolomeo) and hospital (Ospedale Fatebenefratelli - literally translates as 'you do well brothers'). But in the summer lots of bars and restaurants open up down by the water. After a hot day in the city it's a great breezy spot for an Aperitivo. The water creates a lovely atmosphere mixed with some good company and you are set for the evening!