Marine and coastal areas are highly valuable. An estimated 60 percent of the global population lives within roughly 100 kilometres of the shore. But the health of marine environments are declining due to pressures such as climate change, pollution, habitat destruction and invasive species. Increasing individual participation in stewardship actions will be one part of effective management strategies. Marine citizen science experiences have potential to increase individual uptake of stewardship behaviours. However, little is understood about the relationship between different elements that make-up such experiences and the varying effects on willingness to do different stewardship behaviours. In this study We surveyed individuals (n=130) choosing to attend one of 24 marine citizen science events. Using quantitative methods, we differentiate the social and nature aspects of the marine citizen science experiences and examine how these experiences shaped individual willingness to adopt different types of stewardship behaviours.