A couple of places that pick you up and have something to do would be Kings garden for dinner and the kids can climb up the top of the rock tombs high above fethiye. Then you can eat dinner overlooking the bay and get a lift back home. The other is Billys beach barbecue in olu. Not sure if they pick up from calis. They have an an evening of entertainment, lots of acts, all you can eat buffet, which is nice. A campfire on the beach to sit around and a late evening disco. You see lots of familys there and I think its £10a head for adults. Pay for drinks seperately. The other place that picks you up is on the kordon,www.hasankolcuoglu.com.tr, they serve a set menu and bring a kebab on a sword. Or catch water taxi to it.
Gosh, its hard keeping kids occupied and it must be costing you a fortune..remember those days well..happy memories..enjoy x