Why go to the Grand Canyon when you can get all the canyon you want right here in SF? The beautiful walking trails offer you a little bit of "wilderness" in the middle of the city. Stay on the trail or go off the beaten track (watch out for the poison oak!), go up hills or stay down in gulches, walk through shrubbery or over bridges, there's something for everyone here -- there's even space for rock climbing. -- SF Station Spring Guide '06