Kas
Kas (pronounced Carsh) is a delightful city in the very South of Turkey. It is halfway between Dalman and Antalya Airports and a fair distance from both, so it avoids excesive package trade. It also only has a very tiny beach, less than 10 metres wide. However it does have wonderful rock shelves for sea bathing. These are populated by cafes and restaurant who provide free loungers. In return you are expected (but not obliged) to buy drinks etc from them.
The town has many decent hotels and restaurants and is a centre for activity holidays. Within reasonable driving distance are locations for Canyoning, Sea kayaking, cycling, walking, paragliding as well as wonderful beaches.