“Every walk is a sort of crusade,” Thoreau exulted as he championed the spirit of sauntering in an era when the activity was largely a male privilege — for a woman, these everyday crusades meant the dragging of long skirts across inhospitable terrains, before unwelcome gazes. It would take a century and a half of bold women conquering the mountains and reimagining the streets before Rebecca Solnit could compose her exquisite manifesto for wanderlust, reclaiming walking as an activity that…