Iceland often is mentioned as one of the happiest countries in the world and when you look as why the answer is SIMPLE:
Living a SIMPLE slow lifestyle culture revolving around enjoying family, friends and the benefits that the environment and nature have to offer.
Importantly note work is not mentioned. Work in Icelandic culture is not the focus of life. Long hours, deadlines and lack of a work life balance are far from championed.
This is all made possible by a high standard of living. With good workers rights, high minimum wage, high quality heath and social care and pioneering 4 days week trials Iceland makes a stress free life with less of a focus on work more attainable than other counties.