Car hire offices are scattered throughout all the major towns, you should have no difficulty finding one, but if in doubt ask at your hotel reception or tourist information office.
You could also hire one at the airport on arrival, the offices are located in the main arrivals hall.
Another option is to pre-book a car through the internet or with your travel agent, sometimes you can get better rates doing this and it ensures you will have one available on arrival.
Be aware that in the high season, August and July there is a big demand for vehicles so early booking is advised, if not essential.
Moped hire is also commonplace, but just a word of warning... many inexperienced riders hire them, dont wear protective clothing, and frequently have accidents driving on unfamiliar roads or due to thoughtless drivers. Be sure you know how to handle them. I frequently meet people around town or at the hotel, bandaged, or plastered, with broken bones, severe gravel burns or worst. You never have to ask the question 'How did that happen'? the answer if you do is invariably, 'I came off a moped'. It really spoils their holiday.


