The National Park Service and the Southern Arizona Roadrunners will team up for a free, non-competitive four mile and one mile social run/walk on the roads of Saguaro National Park West. Runners and walkers of all ages and abilities are invited but, please, no wheeled vehicles and no pets. The course will include rolling dirt roads and plenty of gorgeous National Park scenery. The run will not be officially timed and there will be no awards or posted results but participants must register. Due to parking and trail usage concerns, this free event is limited to 400 participants.