The place your friend meant was the path that starts just past the Dedem hotel in Hisaronu, beside the depot where the fire-engine, and various equipment is kept. There is a path that is now quite wide that you can follow up the hill through the forest. About 15 to 20 minutes walk depending on your pace. Just before you get to the top of this path, which has a wall either side there is a path, track that goes off to the left. I am pretty sure one of the horse-riding companies goes this way. Another 5 minutes and you are at what is indeed a good view of the lagoon. Much less of a walk than starting the Lycian Way. Not advisable to try foraging your way through the forest to reach Oludeniz though - there is no path down this way from here.