We have just come back from Olu Deniz. It is a gorgeous resort, very friendly, VERY cheap day trips, very idyllic.
The Belceciz beach hotel is right on the Belceciz beach about 5 mins from the lagoon, the beach there is a mix of sand and then stones by the waters edge, at the lagoon it is fine shingle. The sea is really rough though, as I know to my cost, as myself and 9 year old got swept under a huge wave!!
We will definately be returning to Olu Deniz asap, and it is great now the new tunnel is open, it cuts off all the scary windy roads up the mountains!!
Go and enjoy, feel sure once you/ve been you will enjoy.
I am so jealous of everyone going there this summer, it really was my best holiday ever!!