We did quite fancy the trip to Pompeii.
But other friends have said there’s so much to do that taking the time out to do that might be too much.
I don't know how much time you're going to have, but you can do Pompeii in a day from Rome quite easily. It means an early start, but it's perfectly feasible and well worth it. Herculaneum - or the part of it that's been excavated - is smaller and somewhat better preserved. People do manage to visit both in one day but I don't think this is enough time to fully appreciate them. Ostia Antica gives you a somewhat similar experience, but without the drama associated with Vesuvius, and is just outside Rome.
One tip for Rome. Most people want to visit the Colosseum, but the queues are challenging. Buy your tickets from the booth across the road, at the entrance to the Forum. This doesn't get so busy and the ticket covers the Colosseum, the Palatine Hill and the Forum. You can also take a tour with one of the guides who will approach you outside the Colosseum. They have group tickets, so you don't have to queue, and usually offer good value.
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