The best thing about living in Miami is the endless supply of things to do on the weekends. You can lounge on a pristine beach, dive amid neon-hued coral, blast through the Everglades in an airboat, and dance until sunrise at myriad world-class nightclubs. Dave Doebler took one look at the list of those selfish but glorious free-time options and thought, Actually, I would like to spend my Saturdays collecting trash. Doebler runs Volunteer Cleanup, a group that organizes trash pickup operations across Miami Beach. Doebler also chairs the city's Sustainability and Resiliency Committee and has worked to ban polystyrene products from polluting Biscayne Bay. Doebler knows South Florida is an environmental jewel — and unlike the thousands of visitors who vomit garbage on the beach every weekend, he sticks around to take care of it.