For the Twaddell family of Cave Creek, hiking is a family affair. Their patriarch, Graham, an environmental consultant, has been hitting the trails with 10-year-old son Enler and 6-year-old daughter Neala since before they could walk. While the sport comes naturally to them, Twaddell says that getting his kids started in hiking took planning and patience. “I found planning the hike during the week, looking at trail maps together, preparing our equipment and generally talking...