I pulled into the Grand Canyon parking lot at 10 AM with a 4-year-old who hadn’t napped and a 6-year-old who’d just spilled apple juice across the back seat. My wife looked at me like I’d planned this trip specifically to test our marriage. We’d driven 800 miles over three days to get here. And honestly? In that moment, I wasn’t sure this national park road trip with young kids was worth it. But by day five, something shifted. The kids started spotting bison before I did. They begged to hike “just one more trail.” My daughter still talks about…