The increasing occurrence of flood events in Liguria has highlighted not only the importance of effective techniques for monitoring and preventing such events, but also the need to raise public awareness of these hazards. Moving towards a sustainable future, the importance of educating the younger generation on this topic is becoming increasingly evident as a key agent in the decision-making process. As part of the Outreach group of the Department of Civil, Chemical, and Environmental Engineering at the University of Genoa, we designed hands-on activities for high school students focused on the principles of remote sensing, dedicated to monitoring environmental conditions over time and space, with a focus on vegetation for environmental hazard monitoring as a theme of the Outreach group. The outreach activity is organized in two parts. The first introduces basic concepts of geodesy and Earth observation, including geographic reference systems, positioning, and the role of satellites in determining location and observing the Earth’s surface. The second part involves a hands-on experiment in which students photographed the arrangement of natural objects they had created and computed a simple vegetation index (Green Leaf Index, GLI) to provide an indirect measure of vegetation health condition as a proxy for flood susceptibility. The initiative aims to stimulate curiosity, foster discussion on environmental monitoring, and present remote sensing as an accessible tool for understanding environmental change. The activity has so far been implemented in six scientific high schools in Genoa. An informal post-activity questionnaire and observations by the instructors indicate a high level of student engagement and interest in similar initiatives. While the evaluation is exploratory, the results suggest that simple, low-cost experiments can effectively support outreach in geodesy and environmental monitoring.