First of all, having your own vehicle to move around the island allows you to avoid public buses which, although they can be convenient for short distances, are sometimes crowded plus you will need to wait.
Moreover, driving a scooter will allow you to avoid traffic jams as much as possible… and unfortunately, traffic jams are everywhere. But if you’re on a scooter you don’t need to worry, if anything, traffic jams make the roads even safer for you!