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The success of any smart city project or initiative lies in two key factors: on one side, a clear drive to contribute to sustainability and, on the other side, the involvement and contribution of citizens. These two factors should, thus, be taken into account when designing and implementing both the technical solutions and the functionality of smart city systems. This paper presents the Green Bear smart city platform, an IoT system that uses LoRaWAN nodes to gather information on city green spaces, bike lanes, and recycling depots, as well as a user-centered mobile application that allows for active user participation, feedback, and incentivization. This solution is being implemented in the city of Coimbra, Portugal. After an overview of the system, the paper provides a description of each of the main system modules. The Green Bear prototype was subject to functional and technological assessment, and the results are presented and discussed.