There is something about vacation that makes us want to walk everywhere. We stroll through charming downtowns, explore boardwalks, wander through museums, shop until our feet hurt, and somehow decide that a “quick walk” to dinner is a great idea even though our hotel is a mile away. I love exploring a new place on foot, but there is one thing that can quickly put a damper on a vacation: unhappy feet. Blisters, sore heels, swollen feet, sweaty socks, and shoes that seemed perfectly comfortable at home can suddenly become the biggest problem of the entire trip. And when your…