Covering 16,000 acres, South Mountain Park in Phoenix is the largest city park in the U.S. Spring is a wonderful time to hike in the park not only because of the ‘cool’ weather but also the flowers. If the desert has been blessed with winter rains it explodes in brilliant color. Fuchsia, yellow, orange, and blues. And the Cacti have unworldly brilliant blossoms. Enjoy spring in Phoenix.