Lido di Ostia and Ostia Beach
If you would like to spend a day at the see as the Romans do, you could consider Ostia, an ancient seaport located just about 30 km from Rome.  You may go and enjoy the sun in one of the many paying beach establishments or at the free beach of Castel Porziano commonly called the “cancelli“.  The “cancelli” are nothing more than access to the sea and are numbered from 1 to 8. They represent the sea of ​​the people of Rome, available to those who can not afford or simply do not want to join a paid establishment and instead want to visit the free Roman beaches. Here the entry and beach are free and you pay only for what you consume. If you do not want to hire umbrellas and deck chairs, you just take your towel and lie down where you want! These beaches are not as those you see in the catalogs of exotic places, but they have a certain charm and are quite large. Furthermore to get there you pass in the middle of the beautiful Natural Public Reserve Tenuta of Castelporziano.

How to get there by public transport
From the Rome-Lido di Ostia station (Porta San Paolo), attached to the Ostiense station and the Metro Piramide, take the train to Ostia, which has a stop at Ostia Antica,  and get off at the last Cristoforo Colombo station. A train leaves every 10-15 minutes: about 35 minutes travel with an ATAC 150-minute urban public transport ticket.
From Cristoforo Colombo station, take bus number 07, right at the square just outside Cristoforo Colombo station, which will take you to “i Cancelli”.