does anyone know if it's possible/worthwile to go to Formentera for just a day trip, we have accomodation in ibiza town for the week, but want to spend a day in formentera, we would like to combine seeing some of the beaches, with a visit to the 'blue bar' etc, but are unsure if that would fit in with ferry times etc, i,e if you go during the day, what time is the last ferry back to ibiza town???