Put your skills to the test by paddling the Patuxent River, Maryland’s longest river. Choose from a 4.2-mile or 11-mile paddle. Bring your own gear or rent a kayak or paddleboard. Prices vary on length and rentals; After-party at Emory Waters Nature Preserve. 6am-6pm, Jug Bay Wetlands Sanctuary, Lothian, RSVP: jugbay.org/paddleathon/.