8 days is not a lot for turkey... you could only visit about 3-4 places if you dont want to touch and go..
i would recommend you spending at least 3 days in istanbul..
i love shooting at the galata bridge area.
and another place you cant miss is cappadocia, you can spend another 2-3 day there.
stay in goreme...and take the hotair balloon
and 1 place i would recommend is sanfranbolu, beautiful place, although is a bit out of the way.