I will be traveling with a tour group and our last stop is Sorrento. The group is offering an optional add-on tour of Capri for $115 per person. This includes local guide, round trip transportation to the port, round trip transportation by fast boat, and minibus or cable car transportation on the island. The sights that are listed as part of the tour are Anacapri, shopping, La Piazzetta, and the Gardens of Augustus. Is this worth the price? Are we better off purchasing another tour online ahead of time or buying something the day-of right on the island?