Politics and business drove ancient Romans, and both made their home in the Forum. True, to the uninformed eye this is a few square miles of marble rubble. But with a sense of history and some imagination, you can make this one of the most magical places on earth.
Some tips.
First, don’t be cheap; pay to get in. Sure, you can see a lot of the Forum for free from outside. But you need to be down at ground level to get a sense of the size of these buildings. Only then can you really appreciate the drama of the whole scene.
It will also give you perspective on how "lost" this place was for most of modern history. Stand in front of the temple of Antoninus and Faustina, now a church, and its door will hover in space a full story above your head. Why? That was the level to which the Forum had been filled with mud and rubbish by the time the church conversion was made.
Second, pay the secondary fee to get up onto the Palatine. This is one of the seven hills of Rome, and perhaps the most famous. Before the empire, it was the most exclusive neighbourhood in Rome, packed with luxurious town homes of all the best families. Post-Caesar, the emperors slowly bought most of the hillside until it because one massive palace complex.
You get the best views from up here. On the forum side, you get the best view of how the Via Sacra formed a processional route through the area (You know the one … blockbuster parades, Gladiator and Cleopatra). It’s the only place from which you’ll get a clear shot of the pool and inner court of the House of the Vestals. And the views over the rest of the city are dramatic. On the other side, you get the only view of the Circus Maximus that puts it in context. (You know the one … chariot races, Ben Hur.) Only up here can you fully grasp how massive the place really was, and marvel at how exciting those races must have been.
The hill itself is a gold mine of sights. You can scramble around the Domus Augusta, the palace of the emperors, and marvel at the size and sophistication. It even had a private stadium. The nearby House of Livia is reputed to have remarkable wall paintings, but always seems to be closed. There’s also an excellent, small museum that tells the story of the whole Forum/Palatine area.
Third. Do a bit of preparation if you have time. Pop culture thrives on the Ancient Roman scene. Watch or read "I, Claudius". Watch any of the old "sword and sandal" epics. Try Steven Saylor’s "Gordianus the Finder" novels. This fictional detective lives on the Palatine in the late Republic. Saylor’s scene-setting is so accurate you’ll find yourself pointing to corners and thinking: "Gordianus found that clue, just there!".