 This study examined the relationship between recreation in blue spaces, water-based areas, and mental health and subjective well-being. It found that the presence of certain environmental features, such as water, and the quality of these features can influence how people feel after visiting them. Additionally, the type of activity undertaken during the visit was important, as it could either enhance or diminish the positive feelings associated with the experience. This suggests that recreation in blue spaces can provide benefits to mental health and well-being, but only if the right conditions are present. This article was authored by Joanne K. Garrett, Matthew P. White, Louis R. Eliot, and others.