Earlier this summer, when I began planning my family’s first real vacation in two years, I carefully chose which National Parks we’d visit. White Sands, Arches, Bryce Canyon, Capitol Reef, Joshua Tree, and Sequoia National Park easily made the cut—lots of open-air hiking where we could avoid people. We skipped Zion—traversing the crowds and taking the requisite sardined shuttle felt too risky. My kids also really wanted to see Roswell and its aliens, but the main draw was an indoor museum. Though my husband and I are vaccinated, both of our kids are under 12 and therefore unvaccinated. Since the Centers for Disease Control and Prevention had recklessly rolled back its mask recommendations in May, we kept asking, could we visit safely? How many people would be there? How many would be wearing masks?