Here is my "standard" comment on Kaş and the Mediterranean Coast.
Turkey is rather larger than many people anticipate so use Google Maps or Earth for determining distances and the amount of time you can spend travelling.
I personally like the Mediterranean Coast of Turkey which runs from Bodrum through Fethiye, Kalkan, Kaş, Kekova, Demre and on to Antalya and beyond. You will find plenty of sunshine, 300+ days every year! The area is semi arid and in our area we almost never get rain between the middle of March until late September or October.
Usually the tourist "season" for travelers runs from April 01 through the end of October so prices are sometimes higher after April 01 but in late Sep/Oct, things will start to slow down. I keep UNofficial weather records, in September 2010 there was no rain but in late October there were six rain days. The average day temp for Sep 2010 was 32 C and 25 in October.
It should not be difficult to find accommodation almost anywhere you go. If there are competing hotels close by, look around and check with a couple before you decide. Always ask what kind of heat or A/C is in the rooms and do they have hot water. Always ask to see the room before you make your decision and also ask for a view if there is one or a larger room if the one you see is not suitable. Try not to pay the first price that is asked. Ask for their room rate, then ask for a discount. This is standard for most savvy Turkish travelers.
One reason I suggest Kaş for tourists on the Med Coast is because it has a nice central location from where you can take hikes either alone or with a group, in either direction of the Lycian Way. It is nearly equidistant from both Antalya and Dalaman airports and also equidistant from Fethiye to Antalya, the length of the Lycian Way.
Folks can go hiking, sea kayaking (at Kekova), take mountain treks, or visit a Turkish village and eat or even stay with a family. There are a great many activities to keep you busy, along with a laid back restaurant and bar scene. You can also just lounge around and do a lot of nothing. Kaş often has concerts both at the harbor and sometimes in the renovated ancient Hellenistic theatre.
Take a look for yourself and decide.
MEDITERRANEAN COAST:
Turkey Travel Planner for fun in the sun:
http://www.turkeytravelplanner.com/go/med/index.html
LONELY PLANET:
http://www.lonelyplanet.com/turkey/mediterranean-coast
TRIP ADVİSOR:
http://www.tripadvisor.com/Tourism-g658661-Turkish_Mediterranean_Coast-Vacations.html
LYCIAN WAY: Where there are many, many ancient Lycian, Greek and Roman ruins:
http://kasadventuretravel.blogspot.com/2010/08/lycian-way-turkey.html
KAŞ, TURKEY ON THE MED COAST:
LONELY PLANET:
http://www.lonelyplanet.com/turkey/mediterranean-coast/kas
TURKEY TRAVEL PLANNER:
http://www.turkeytravelplanner.com/go/med/kas/
TRIPADVISOR Kaş forum:
http://www.tripadvisor.com/ShowForum-g297965-i4654-Kas_Turkish_Mediterranean_Coast.html
and a couple of travel sites:
http://www.kas-adventure.travel/
http://www.kas-travel.com/eng/
Hope this helps and that you have a great holiday in Turkey. Hoşgeldiniz (Welcome)