From the airport:

The only road from the Ixtapa / Zihuatanejo International Airport leads directly to the Highway - Mex. 200. At the Highway, turn left and head North. First, you will pass through Zihuatanejo then climb the hill overlooking Ixtapa. Continue Northerly through several small towns for about 16 miles (26 kilometers). The Troncones turnoff is marked by signs on both sides of the Highway. Turn left and take the short drive to the beach, then turn right and follow the signs to the Inn at Manzanillo Bay.