I have recently returned home from Green Nature Diamond in Marmaris with Jet2 Holidays.
I had assistant Travel with Jet2, and this went smoothly in both airports.
The Hotel was spotless, very clean, lovely staff, Mervlot the waiter was very helpful; Tuguy also helpful and attentive; Cem for entertaining us and a fantastic little cleaner, (unfortunately never got her name but we were in room 3204) Rooms were big enough for the 2 of us, very comfortable. Food was plenty and definitely something for everyone.
My only bugbear(s) was the hotel stated no electric buggies allowed, yet there were many around, which had I been aware of would have helped me massively, as there is a fair distance to walk between my room to swimming pools (for me) or snack bar, or even Volo bar/ breach. Also, it would have been very helpful to have actual steps to walk into one of the pools rather than the ladders, meaning I could not access in the pools in 31 degrees heat in the fortnight i was there.
However, cannot fault the experience.