Start at St. Peter’s Basilica after 1:30 PM, allowing 30–45 minutes for security at the entrance in St. Peter’s Square. The basilica is generally open until 7:10 PM, though last entry is earlier and hours can change for religious events; shoulders and knees should be covered, and large bags are not practical. Give yourself about 90 minutes inside for Michelangelo’s Pietà, Bernini’s baldachin, and the extraordinary dome interior. From the square, walk east along Via della Conciliazione toward Castel Sant’Angelo—an easy 15-minute route with broad views back toward the basilica. Admission to the fortress is usually around €16, and an hour is enough to explore the ramparts, historic rooms, and rooftop panorama; check the official schedule because it is commonly closed on Mondays.
Continue from Castel Sant’Angelo across Ponte Sant’Angelo, allowing 20 minutes to pause among Bernini’s angel statues and take photographs as the light softens. Then wander through the narrow streets of the historic center to Piazza Navona, roughly 15 minutes on foot. Spend 45 minutes around Bernini’s Fountain of the Four Rivers and the surrounding cafés, but avoid eating at the most prominent square-front terraces, which tend to be expensive for the quality. Finish at Armando al Pantheon, a short walk away, for a reservation-worthy Roman dinner—carbonara, cacio e pepe, and seasonal specialties are the right choices. Budget about €35–€55 per person without drinks; book ahead, especially for Friday evening, and expect dinner to last around 90 minutes.