We got off the ship at 9.15 am so by this time a lot of the passengers had already got off.
We knew the ticket office for the hydrofoil to Capri was literally 7 minutes walk away. We proceeded across there but please beware of locals trying to get you to go on taxi trips as their selling prowess is a little over enthusiastic to say the least. The fare one way to Capri is 32 Euros. You purchase your ticket before you get on the Hydrofoil. We went on the fast ship about 40 minutes and the provider of this service was SNAV. Upon arrival at Capri we immediately bought our return ticket for Naples as I had read on this site that it was advisable to do so. You specify which ferry time you want and we thought 1630 would leave us enough time so we bought tickets for that one but you can use the ticket to get on any boat before that. Obviously if the ship is crowded later and you have a ticket for an earlier ship you may get refused onto it but we had no problem getting on the 1440 hydrofoil.
Anyway upon arrival at Capri should you want to go up to the town you need to purchase a funicular ticket (this takes only a few minutes to get up to the top of Capri where all the shops and restaurants are). In the height of summer the queues may be long but we were only queuing for 2 minutes.
Capri is lovely, lots of atmosphere and little alleyways we walked around looking at all the designer shops and then had lunch before returning to the ship. There are restaurants as you get off the hydrofoil also but the ones in Capri are lovely so we decided to eat at one overlooking the sea.