Seen a few queries about the Olympos Tree houses. We went 2 years ago and had a fantastic time.
Started with a 3 day /2 night gulet cruise from Fethiye which showed us some wonderful places with backwater stops overnight along the way. Price included a bus transfer from final boat stop into Olympos. Just tell the driver when you want him to stop at the tree house pension you want...we didn't book but you can if you check out the internet.
Stayed in Tree house pension but upgraded to a "bungalow" rather that the very basic tree house which was a shed on stilts, no windows and a mattress on floor, £5 per night inc bed breakfast and evening meal. The Bungalow was £8 per night had windows, fan, and proper beds and en suite & meals as above.
You can walk down to the beach through the ruins and just chill out. We were in our late 40's and thought we might be the oldest hippies in town but there were older people and families with kids so great age range.
No TV so in evening everyone just sat under the stars drinking & playing chess, backgammon etc etc.
If you want to go to Chimera then most of the pensions have organised trips in the evenings for a few £s. Be warned it's a hot long walk up hill with no lighting so take a torch and good shoes and loads of water.
When you want to get back home, then there is a bus that takes you up to the main road where you can get the bus back to Fethiye and this was very cheap and took the coast route so great views as well.
Hope this gives you all an idea of what its like but we would highly recommend it if you are a bit of an old hippy and want a few days chilling out and an unique experience for a few days.
Have fun and try new experiences as they say" we're only on this earth once":D