Everyone goes to Rome. Nobody explores Lazio. This 5-day itinerary gives you 2 days in Rome (Colosseum + Forum + Pantheon + Trastevere + Vatican) PLUS 3 days exploring: Tivoli (Villa d'Este + Villa Adriana), the Castelli Romani (Frascati wine, Castel Gandolfo lake), Civita di Bagnoregio (the dying city on a cliff), and the Etruscan tombs at Cerveteri.
Each day is a logical geographic loop. Mornings for sights, afternoons for food, evenings for aperitivo.
Days 1-2: Rome essentials. Day 1: Colosseum + Forum + Palatine (half day), Pantheon, Piazza Navona, Trastevere dinner. Day 2: Vatican (Sistine Chapel — FIRST THING, 7:30am entry), St. Peter's, Castel Sant'Angelo. Day 3: Tivoli (40 min). Villa Adriana (Hadrian's 120-hectare personal city — the Canopus pool, the Maritime Theatre). Villa d'Este (500 fountains in a Renaissance garden — the water organ plays automatically). Day 4: Castelli Romani. Frascati (wine + porchetta). Castel Gandolfo (papal palace gardens, Lake Albano). Nemi (strawberry festival in June, Roman ship museum). Day 5: Civita di Bagnoregio + Cerveteri. Civita (1.5h from Rome — the dying city on a clay cliff, accessible only by footbridge). Cerveteri (45 min from Rome — Etruscan necropolis, tombs shaped like houses, 2,600 years old, UNESCO).
Best time: April-June, September-October. Book skip-the-line tickets for major attractions.