This six-mile loop over the rolling hills of Harvey Bear Ranch introduces hikers to the wild terrain of the Diablo Range southeast of San Jose, California. Harvey Bear is a section of Coyote Lake County Park, which is popular with campers, boaters and paddlers. As the wide-open trails ascend, expansive views of Silicon Valley to the north and the Santa Cruz Mountains to the west open up. Best times to go: The hills turn a shimmering green in February and March, and wildflowers dot the hills throughout the spring. October and November bring the annual tarantula migration, though sightings of the big hairy arachnids can be rare. Summer is typically too hot.