Ostia Antica is great fun for all ages!!! The four of us visited on a friend's recommendation, and were so glad that we made the trip. Wear sensible shoes (the footing is uneven everywhere), bring a water bottle (there are plenty of taps to refill it) and prepare for the intense sun! And make sure you have charged camera batteries and space on your memory cards. You will likely be here ALL DAY exploring what was once probably the most bustling port town in the Roman Empire, from dazzling mosaics that lined the floors or former bathhouses, a labyrinthine necropolis ("City of the Dead," aka cemetery), a beautiful theatre (still occasionally used for concerts!), the mill and bakery, with many intact grinding stones (Ostia once made most of the bread consumed in Rome), and countless other finds.
There is so much to explore, and the access and photo opportunities are both fantastic. And you can get there from Rome and back for 3 euro per person (1.50 per trip). Admission to the ruins is 8 euro per person, plus 3 euro for the museum and special exhibits. We paid the full 11 each but never even made it to the museum because we had so much fun wandering the ruins all day. Unless your guidebook offers some details about Ostia Antica, I'd also suggest springing for the 2-euro map. There is an audioguide as well, but our guidebook (which offered lots of background info) said it was pretty dry, so the four of us chose not to spring for it. Keep an eye out for the gatti degli scavi (cats of the ruins)! :)
The cafeteria is surprisingly good for a "museum cafe," with options for vegetarians, vegans, and gluten-free eaters (at least the day we were there). Slightly privy for what it is, but not ridiculous. Our guidebook also recommended bringing "a covert picnic." Snacks would be a good idea. We ended up stopping at the cafeteria again late in the afternoon for caffe and gelato as a pick-me-up before the train ride back to Piramide.
Other ideas while you're enjoying a crowd-free day outside of Rome: hop back on the train at Ostia and head out further toward to beach! (There are 4 beach stops.) Or when you're changing from train to metro at Piramide, leave the station to check out the actual pyramid across the street, for which the station is named. It's actually a tomb, and has been incorporated into the walls of the Protestant cemetery where British Romantic poets John Keats and Percy Shelley are buried. You can also check out some remnants of the city walls, including the Porta Ostia, the gate that faced Rome's trading post to the south. Beware that, depending on the day and time you go, you could hit some crowds on the train rides back into Rome, and that the schedules are different on weekends and holidays. Have fun!!! read more