simple, rustic, and beautiful/pleasant in a way that represents an ideal scene of paradise in country life (often used as "Arcadian");
e.g. The painting depicted the Arcadian scene of a sunlit meadow with wildflowers.
(noun)
a person who is a native of the mountainous region of Arcadia in southern Greece, or broadly, a person who lives the kind of quiet, simple life that is seen as ideal in the countryside (used as "Arcadian");
e.g. He wanted to spend the rest of his days living as an Arcadian, enjoying life's simple pleasures.