BLOW BAG
Battery- Make sure it starts the car on one click
Lights- Check for busted lights
OIL- Check if the oil is at the right amount
Water- Check if the radiator is well filled well
Brakes- Do they work properly and no uneasy sounds
Air- Check the tires for recommended air pressure
Gas- Always make sure that the car you rented has a full tank of Gas
And most especially prepare your self ( The designated driver )