On a budget, weigh it — Vatican Gardens Tour isn't cheap for what it is.
€37+ (open-bus) / more guided
A calm, green, low-crowd corner of the Vatican most visitors never see — fountains, sculptures, and views up to St Peter's dome, accessible only by pre-booked tour. It's relaxing and exclusive-feeling, but it's an add-on cost and you're tied to a fixed time and route.