Letus take gon hera Sun SutHle 421 Eat Shop Relax Sun Shuttle is YOUR transit service in Green Valley and Sahuarita. Ride Route 421 to connect to the Sun Link Streetcar in Downtown Tucson. eave tne orivihetv Ms! 2 TUCSON For more information visit suntran.com/sunshuttlesun shuttle or call (520) 792-9222 137920