Yoga classes in India, tango-dancing in Buenos Aires…cooking, archeology or art appreciation…traveling with a purpose, integrating an interest of yours into your vacation is a great way to enrich to your travel experience. And it can be a lot easier (and more affordable) to arrange than you might think. Even with only a day or two to spare, you can fit in a class or a course—and you don’t have to look far to find them.