Stuff to do in Turkey
Lots of good rugs if you are in the market. Hereke mainly but the rug dealers carry persian, oriental, etc. The sales pitch itself is worth a visit. They sit you down, bring you drinks and parade the merchandise in front of you. They are also big into leather goods, jackets, purses etc. Sliver & Gold are is popular in the markets (Soukes) Alot of guys bought handmade highly ornamented shot guns while I was there. Good quality decent price. Lots of cheap copies of stuff (rolexs, designer clothes etc)
As for the food, try the Donni Kebab and an Efisis beer. They are a Muslim country but very secular and modern in their beliefs. (read laid back) In fact if you have three days you may take a trip to Ephisis if you are into history. Whitewater rafting is popular in the mountain areas. Turkish baths are nice, kinda like a massage and steam bath.
Hope that this helps.
P.S. If you are in the market for a big ticket item like an expensive rug, go early and be the 1st customer of the day. It is custom that they must make a sale to the 1st customer of the day and they are more willing to deal if you start to walk away.