Julia Carmel | Los Angeles Times (TNS) LOS ANGELES — There are 63 national parks in the United States, but at the start of 2023, I’d made it to only one. So when my partner, Reanna, bought us tickets to see Big Thief and Lucinda Williams at Colorado’s Red Rocks Amphitheatre, we had an exciting (though surely unoriginal) idea: What if we made it a road trip? As I began researching the best routes from Los Angeles to Denver, I found variations of what’s been called the Grand Circle road trip, a loop of national parks that typically spans Utah, Colorado and Arizona.