the cave churches in Goreme are fantastic. i visited in July 04. it's not too hot in this part of Turkey in summer. the Turks are the kindest people i've met in the world and you will feel safe and welcome wherever you travel. the WHS takes about 1/2 to do justice to. try to drive there. walking from town is a trek. it only costs about $5 to see it all. while the site has sidewalks near the rock churches, you need to climb up lots of stairs and crawl into places to really see it fully. Goreme town itself is an amazing site itself. try to stay in one of the "fairy chinney" hotels in town-- like nothing else. Also, spring for a balloon ride to see the whole valley of wonders.