We stayed over at Letoonia and we got a taxi a few times, it's not very far along the road and not expensive. As far as I know there is no dolmus up to Letoonia. However, once your Mum and Dad get there and eat their meals every night and have a few drinks, they may not want to go into Fethiye, which is why the Letoonia ferry stops so early. Everyone is in the restaurants, bars or at the shows, as it's all inclusive people take advantage of that and don't go out at night and spend money.
Jacqui.