Bicycles are as quintessentially Colorado as 14ers and national parks, and for decades, Greg Townsend provided that very opportunity for countless young people -- leading them from the medium-security correctional school where he worked in Watkins, Colorado, on rides across the country. A new film, "Hard Miles," is based on Townsend-- starring Matthew Modine. It screens Saturday at the Denver Botanic Garden as part of the Denver Film Festival.