we plan to take ferry from Barcelona to ibiza on 20th.Shall we book the ferry ticket in advance.If so ,how?'cause we have booked the hotel in ibiza, it's important for us the reach ibiza on 20th.Thanks!
Definitely book whatever you can at this point. There's cross over in lines as well -- like I think Umafisa and Trasmediterranea share bookings. We left it until a week in advance and couldn't get a ferry home when we planned -- fortunately, we were able to stay on at the hotel an extra night.