The Map of Opportunities is a knowledge and innovation instrument created by citizens, communities and other local stakeholders together with experts around the GreenQuays project area in the Breda city centre (Netherlands), where the river Mark will be daylighted again. In other words, the previously buried watercourse will be opened up again and restored to more natural conditions. The resultant map shows (a) the identified problems due to the lack of urban greenspace and climate change impacts and (b) opportunities for improvement from a citizen / local stakeholder perspective. As the daily users of the space, citizens contribute valuable specific experience and knowledge. The first version of the map is a result of a first City Safari. Here, residents, local architects from the area, education-related person, representatives from housing corporations, and experts walked together and stopped at different places, where they checked and discussed the options to boost NBS in the city based on citizens' experiences and perception and expert's knowledge. The work on the Map of Opportunities was continued in further co-creation workshops with the local stakeholders and experts. The map has been taken up as a supportive tool to be used by the urban planning and other departments of the municipality as well as for planning and actions of the regional health service and the regional water board. This is thus a unique instrument that began as a bottom-up innovation instrument to collect local knowledge and perspectives, and was formalized by the local government upon completion.