An early-morning or small-group tour keeps costs reasonable while still giving you a guide's context; a private tour is worth the extra cost if pace and privacy matter more than price.

Either way, save the evening for a walk back to St. Peter's Square after dark — see our Vatican-area hotels for couples guide for where to base yourselves.

Weekday mornings outside school holiday periods tend to have the fewest large tour groups passing through at once — worth asking a tour operator directly which slots they consider quietest, since they generally know their own booking patterns better than a general rule can capture.