Just buy the visa stamp from visa counter, before getting into the passport line. Branches in major hotels offer additional hours. Exchange rates at hotels and banks are only slightly different. USD and major credit cards are widely accepted. The electric current in Turkey is 220 volts AC in all parts of the country.
Nights are somewhat cooler in central Anatolia.
July to August is much warmer, perfect for enjoying the beaches in the coastal areas. The climate varies during the winter. The dress code in Turkey is generally informal. But men will find out that a jacket and a tie is appropriate for top restaurants and hotel dining rooms in Istanbul, Ankara and Izmir. Comfortable walking shoes are a must.