The Lazio landscape varies from the gently undulating green hills of its north to the mountains south and east of the capital.
The south of Lazio is where you might want to spend some time, perhaps on your way to Naples; the monasteries at Subiaco and Montecassino are just two worthwhile stops.
Much can be seen easily on day trips from the capital. For good places to swim, visit the coastal resorts of Anzio or Nettuno. The ancient sites of Ostia Antica and Hadrian's Villa at Tivoli are two of the area's most important sites, and very accessible from Rome.
Farther afield in the north are the Etruscan sites of Tarquinia and Cerveteri. Or do as the Romans do, and head out on weekends to soak up the gentle beauty of lakes Bracciano, Vico and Bolsena, and beach resorts like Terracina and Sperlonga.
Ponza Island is one of the loveliest spots on the entire west coast.