Dust off your bicycle, pull on your hiking boots. Tomorrow the nonprofit Rails to Trails Conservancy is hosting its annual ‘Opening Day for Trails,’ a chance for outdoor enthusiasts to explore the Jones Falls trail and celebrate nature.Jim Brown, manager of trail development, tells us about the festivities planned and describes how a coalition of community groups and city agencies are working to create a loop of easily accessible trails around Baltimore. The goal: to bridge the gaps between neighborhoods and to repurpose abandoned land.