Before you come to Ibiza, you should know the general situation about local transportation. Which direction do the drivers go?
The right direction to go is right. Do not make a mistake. The roads here are wide and smooth. Any signs about transportation can be seen clearly.
If you want to hire a car here, you need to make it at the airport or in your hotel. But the road situations are not good here, Traffic jams are often no matter what time it is. But you can also have one at free time not the rush hours. Or you can have a taxi, which are remarkable in the colors of green.
To be honest, travelling by bike in the city is a good way. You will not be too tired to walk. And you can have a rest whenever you want. Having a bottle of water and a helmet with you is the best way to travel around.