Credit cards are accepted in most shops and restaurants in the main Cities or Resorts areas. This may not be the case in smaller villages or remote places so it is generally a good idea to try always to have some cash handy.
There can be mosquitoes in certain areas so some form of repellant is advisable, especially for those people who are prone to bites, it is also a good idea to take precautions in your bedroom with a mosquito plug, spray etc. Ants are frequent in some rural areas.
As in the most of the Mediterranean, Turkish Drivers may appear to drive somewhat �unpredictably� Turkish Roads and Highways are generally in good repair but some coastal or mountain roads can be a little narrow and winding.
This depends on your nationality. At the time of writing the Turkish Ministry of Foreign affairs posts Visa information on their website here: http://www.mfa.gov.tr/MFA/ConsularInformation/ ForForeigners/VisaInformation/