9 a.m. beginning at Green Springs Park, 994 Enterprise Osteen Road, Enterprise. Join DeBary Hall historians Tracy Mestre and Lisa Perez, along with Environmental Specialist Holly Giles, for a 15-mile bike ride from Green Springs to Guise Road. The tour begins with the history of Green Springs, the native plants of the area, and how the springs are affected by our water quality. There will be stops along the way, with one restroom break at the Osteen Civic Center. Come for the whole tour or as far as you want to ride. Children age 12 and older are welcome if accompanied by an adult. All participants should bring a helmet and water. Sunscreen is recommended. Free.