Describing a Peaceful Environment should be one of these things:
Friendly People: Having a lot of friends could make you a peace maker, like having them like everyday is a Peaceful warm day with no enemies.
Cheerful People: Like waking up every day in cheering like life is a breeze, this will definitely describe a Peaceful Environment.
Clean Environment: This will describe a Peaceful Environment too, every day seeing a clean place could make you feel chill & relax without worrying an another problem.
So these are the details for describing a Peaceful Environment