I go at least 3 times a year allways found that the cheapest way to hire a car is to position yourself in view of the car rental desk at the airport stand back dont get to close in no time at all you will have all the agents around trying to get your buisness take your time and keep a smile on your face and you will come out on top. The best price that i got was 300pesos per day same price as a motor bike but the car left a lot to be desired. The average price for a 10 day rental is 600-750pesos per day