Best way, to get arround on the little island Diu is to rent a moped ... the costs are like 1 € per day and you are flexible and can drive to where you want. I think there are three moped/motorbike rentals and everybody can tell you where they are located.
For the 1 € per day you receive the best service... I had to broken tires in 2 days and they came, picked me and the bike up and fixed it for free.
Maybe its a bit more expensive now, but I think it's still cheap....













