On a cruise which stops in Naples. Would like to go from Naples to Capri then from Capri to Amalfi. I know there are ferries to Capri, how abut from Capri to Amalfi?
I think Sorrento is the hub. I don't think you'll be able to see Capri plus Amalfi easily in one port day though.
There are small boats that run between Capri and Amalfi. You probably would have to come back through Sorrento. Schedules are unpredicable enough that I think trying to do all of this is a bit of risk to getting back to your boat in time.