There is a bus from Rome to the entrance to the old town. The Rome terminus is Lepanto Metro station on Linea A. There is also a train but the station is less convenient.
If you hire a car at Rome's Fiumicino airport follow the road to Rome for a few km and then take the Autostrada signposted in the direction of Civitavecchia. The exit to Cerveteri is about 15 minutes later, depending on how fast you drive. The Necropolis is to the north of the modern town and reasonably well signposted.
At the necropolis, a true street for the dead.
There's a local bus from where the Rome buses start to the necropolis.
The old town is very small and walking is all that is required. The new town lacks interest.
A major tomb
Etruscan Necropolis (Necropoli della Banditaccia). The main sight, and a quite remarkable one, is the Necropolis of the Etruscans. This was built on town planning principles similar to those for cities of the living and it is truly a 'city for the dead' to enjoy their afterlife. As you drive to the entrance you will see that the area of tombs is really extensive. Much excavation is still being done and only a small part of the total area can presently be visited. Despite the proximity of Cerveteri to Rome and the importance of the site the Necropolis is not over-visited and a visit can be a pleasant and unhurried experience. Admission is 6 Euros. Under 18 and over 65 free of charge. There is a pleasant bar with outside tables.
The museum in the old town is also well worth a visit.
Inside a tomb
"Cippi": Etruscan phallic symbols indicating that the tomb occupants were male
The Bed and Breakfast Casa di Anna at Largo Boccetta 5-6 is very good and, equally important, seems to be the only accommodation in the old town.
Ceri is almost due east of Cerveteri (take the road to Bracciano and turn right at the junction). It goes back to Etruscan times but the town as it looks today was founded in 1236, when the inhabitants of Cerveteri moved to Ceri to seek protection from its position on an outcrop of tufa volcanic rock. There is a one-lane street leading up the side of the rock to the town on top. This is controlled by traffic lights, which take a long time to change. Don't be tempted to jump the lights or you could find yourself with a long drive back down the hill in reverse!