LynnJenny
We have stayed right next to the Green Nature. I would say it is quite a walk along to the Marina and it would depend on how fit your inlaws are and whether they like walking (in all that heat). PHEW!.
Green Nature is situated in the Siteler area of
Marmaris (Icmeler end of Marmaris) and tho we actually stayed in Kaan Aparts right beside the
hotel we visited Green Nature and ate there occasionally. Other nearby hotels are Pineta, Grand Azur and its not that far from Migros Supermarket. Its about 10 min walk down to the main road and from there it would be best to catch the dolmus along to the centre. We have done the walk along to the marina /bar street in May and it was managable but tried it in July and toiled!
Theres lot of bars /restaurants in the area but sure Celine20002uk will be able to offer good advice as she has stayed there several times.