I am wondering the same. According to Rome2Rio, taxis from the port to Ravenna are $24-$29 one way. Or $48-$58 RT. That of course is for multiple people. Vs the $69 pp that Azamara is charging for a RT. In addition, with the Azamara shuttle, you are in the city for 3.5 hours. If you take a taxi, the time can be longer if you please. I am thinking of the taxi option