Hiya Kirsty, we went over in September last year, all 33 of us, and may daughters, son, nieces etc. were just like you, thought it would be boring, nothing to do etc. etc. We were at Marmaris the year before. Well they all had a great time, there is something for everyone, all ages. The ages of the "kids" were from 17 to 29, and they all had a ball. There are two discos in Calis, and loads of pubs, restaurants, loads of lush looking guys as well, all very attentive, but not too pushy. They enjoyed it so much they all went back out within two weeks of coming home and again had a great time. They met so many friends over there and had loads of fun, try the Post Office (pub) very lively, smashing bottles behinds the bar, just for fun, dancing there as well, pool table. If you find Calis too small, then 5 minutes on the Dolmus takes you to Fethiye, which is all hustle and bustle, the "kids" ended up there quite a few nights, there are great bars etc. Because it is reasonably small, everyone knows one another and you are never short for someone to talk to. I bet you have a great time.
Helen