At the 8th-century Borobudur, the world’s largest Buddhist monument, in Yogyakarta, Indonesia, I panicked. Our guide, Hariyanto, had just handed me, my four and a half-year-old daughter, Indah, and my 75-year old dad the UNESCO-required pandan leaf sandals to explore the monument. With notoriously sensitive feet, my dad fumed: “They expect people to walk up and down uneven steps in these? How much...