A number of Future Internet testbeds are being deployed around the world for research experimentation and development. SmartSantander is an infrastructure of massive scale deployed inside a city centre. We argue that utilising the concept of participatory sensing can augment the functionality and potential use-cases of such a system and be beneficiary in a number of scenarios. We discuss the concept of extending SmartSantander with participatory sensing through the use of volunteers˘ smartphones. We report on our design and implementation, which allows for developers to write their code for Android devices and then deploy and execute on the devices automatically through our system. We have tested our implementation in a number of scenarios in two cities with the help of volunteers with promising results; the data collected enhance the ones by fixed infrastructure both quantitatively and qualitatively across the cities, while also engaging citizens more directly.