From the Airport
Just drive out of the airport and head towards and through Zihuatanejo. Stick on the main road, 200. Don't go into Ixtapa, but stick to the right at the top of the hill. Follow the signs towards Lazaro Cardenas. At km 42 Los Llanos turn left and find your way to the beach. Be careful.
About $70 from saladita to the airport. Most taxis have a list of official rates. From the airport walk outside the airport parking lot and bargain. Take a combi till they turn off the highway 200. Get out and flag down a bus.
Great deal, but slow. Just flag one down and get of a km 42 los Llanos.
Get your rental ahead of time online. Even then, they will stick it to you with insurance on the ground.