Join a 5-mile bike ride along the Spring-to-Spring Trail from Lake Monroe Park to Gemini Springs. Along the route, there will be a stop for a 1.6-mile hike to explore the wetland habitats of the Gemini Springs Conservation Area. Age 10 and up are welcome; children must be accompanied by an adult. Bikers must bring their bicycle. Participants must wear closed-toe shoes and a helmet. Free. Registration is mandatory. Visit http://www.bit.ly/green-volusia.