I live in Turkiye :) I can give you a very much detailed information according to your vacation habits. for example if you like to taste Turkish cuisine you should start your travel with Gaziantep and by the time you finish your cuisine vacation you would get 15-20kg. do you like to see historical sites? then entire country would amaze you. do you want winter sports? there are plenty of ski resorts in Bursa, Erzurum. do you like sea side holiday or to dive? then any western and southern coasts will satisfy.
so again.. what do you need to know? what's worth seeing is not helping cuz there are entire "worlds"™ in this country