We didn't explore Giza to much as we were there during the governmental protests. Enjoyed Egypt anyway!
Some people is not nice especialy Horse man. They very annoy the trip. He force to use his horse for short tour around Pyramid optional 800 , 1200 1600 egypt pound in fact I found only 200 Egypt pound with the same tour around pyramid on next day.
From the Cairo airport to Giza, it can take about 2 hours. Rather prearrange transport to your hotel as it can become overwhelming when taxis services start to hound you.