If you are staying for 4 days then you probably wont need any transport, as there is enough at the beach unless you wish to see more of the area. However if you are staying longer then I would suggest getting a car, so you can get about. The airport is 25 mins away and costs approx 50 euros by taxi to the Villa. Same again for Ibiza town which is 30 mins away. San Jose is 15 mins away by car. There is a bus stop found just behind the far end of the beach this has regular buses to San Jose, San Antonio and Ibiza town during the summer months, though we have not used it as we hire a car. We often hire bikes as there is are a number of tracks of road, but be warned the hills are quite steep