New Trails Fitness Hike at Pima Dynamite Trailhead   This Very Difficult hike due to its 9 miles over about 4.5 hours covers some rolling hills for Experienced hikers. Explore the impressive new trails with nice views and granite formations. Arrive 15 minutes before start of hike.  Bring water, snacks and even a lunch for

Sonoran Desert packrats have been collecting and preserving things found on the ground for 40,000 years! Stop by the Trailside Naturalist Station at the Gateway Trailhead between 9:00 and 11:00 A.M. to learn how ancient packrats and their distinctive behavior assist today's scientists who study the history of desert plants, animals, geology and climate.