The only right places are the places you want to go!!
It will be cold, maybe even snow, but as long as you are prepared for that you will be fine.
Pamukele really only needs one day. At that time of year I would either skip it and add the time to Istanbul, or add in Ephesus in your 3 days.
Get a connecting flight to Cappadocia as soon as you land in Turkey, then do the rest of your travelling before finishing safely in Istanbul for your remaining days, so you have no possible hiccups if weather delays a domestic flight before yiour international flight home. This also simplifies logistics on arrival- saving you time and money transferring into Istanbul then back to the airport late. Even better if you can book a ticket from home, straight through to Cappaodica via Istanbul.Edited: 13 June 2018, 01:16
Great! thanks for the insight :)