Mt Orlando is a protected natural park. From the top you can admire the views of Serapo Beach on the Tyrrhenian Sea, the Gulf of Gaeta, the town of Gaeta, and "Old Gaeta". At the top of Mt.Orlando you can visit the Mausoleum of Lucio Munanzio Planco, one of Caesar's generals. Also, remains of old fortifications still exist which can be explored, so bring a flashlight.
Serapo beach is one of the biggest, sand beaches in Italy, and the town about triples it's size in the summer vacation months (mostly August). If you come in September or June, it'll still be warm enough to be at the beach, and the crowds should be gone, the ugly umbrellas should be taken down off the beach and the costs should be down too. You can get to the beach easily. When you come into town on the bus, you'll be on the water. Gaeta is a peninsula, so just walk perpendicular from the water, and you'll hit the beach. It's probably only about a five minute walk if you go up the street that the post office is on the corner of. It's the next street up from the one Bar Triestina is on (going in the direction the bus came into town). Turn right at the post office, and you'll see the beach in a few minutes.
Serapo Beach is quite magnificent and if walking up Mount Orlando (down is easier), there are many opportunities to take a snap of it.
Walking through the streets of this picturesk city is actually such a relaxing experience, everywhere you go the old country feeling is just everywhere.
The church is Neo-gothic in style and built in the form of a Latin cross as many of the old Roman churches were. The view of Gaeta from this church should not be missed.
A beautiful statue of Mary & Jesus stands at the top of Mt. Orlando. An excellant overview of the entire area from this vantage point.
This mausoleum is the best preserved in all of Italy. It was the burial place of Lucio Planco, one of Caesar's generals, who died in 22 B.C. The tomb is 45 ft high and 97 feet wide.