Did a variation of this some years ago. If in summer, be prepared for the heat. Pompei was very interesting and eye opening. Got a big laugh when the guide showed one of the rooms that had a menu showing pries for different sex acts.😄 The guide compared it to a McDonald's.
Also, the bus ride is a bit treacherous with quite winding mountain roads. I remember one section of the road, one lane only, where cars have to wait for the light to change before any cars can proceed.