Planning Tips:

Allocate more than two or three days to experience this truly unique area.
Do include Konya in your Cappadocian itinerary. It was the once known as Iconium under the Romans and later became the capital of the Seljuk Sultanate of Rum. The best examples of Seljuk architecture and calligraphy can be seen here.
The culture of rural Turkey is conservative so modesty and polite manners are always appreciated.
Be sure to keep yourself hydrated and to pace yourself in the summertime as the heat can be quite fierce.
Try to vary your activities. Unless you are a Byzantine specialist, visiting the 50th rock cut church on the same day becomes a blur.
It is worthwhile to explore the area around Guzelyurt. Particularly interesting is the nearby Kizil Kilise (Red Church), a 6th century cruciform church with a dome that sits on top of an unusual, octagonal structure. This graceful, little church was constructed from red trachyte, a type of volcanic rock.
Do visit the rock fortress of Ortahisar, the spectacular Devrent Valley, the lush Soganli Valley and other well known sites. These areas have not been mentioned only because substantial information is already provided in most guidebooks.
Purchase a good road map prior to leaving home. They are difficult to find in Turkey, especially outside the main cities.