I can recommend you Afyon but it is really far from istanbul ..
- About 8 hours by car from istanbul but king of thermal hotels ..
www.orucoglu.com.tr/
* Afyon is small place and famous with its meat and sausage
(Att: We are muslim and we do not eat pig and sausage is not pig meat)
* Also yogurht cream with honey
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- Also there is one place in Adapazari Kuzuluk about 4 hours from istanbul ..
* Very small village you may not like the atmosphere .
* A religious place where people salat five times a day.
www.ihlaskuzuluk.com/
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What we can do is ;
- Transfer you to your hotel
- Reservation of your hotel
- Transfer you to airport again
Thank you
Best Regards
Visitistanbul.org