Kotoka International Airport (ACC) in Accra is only a 10-minute drive to the Temple via Liberation Rd. Car rentals and taxis are available from the airport.
Driving here can be very stressful and hectic. You may want to consider taking taxi's, the local government-owned State Transportation Corp. (STC) buses (http://www.stcghana.com.gh/), or even hiring a driver. It's always best to negotiate a price with a driver before getting in the car.