The newly-named but long-existent voluntourism industry is rife with potential problems. People project their culture's values on cultures they view as "lesser." People start initiatives that matter to them, without listening to what matters to the community. Even when a project is responsive to community voice and values, it is often not sustainable. The privileged among us like to view ourselves as white knights who can swoop in and make everything better, when often we are really just bulls in china shops: wreaking havoc, interrupting functional systems, creating dependencies, and leaving things worse off than when we got there. So if we tourists want to find some useful ways to fill our time, how do we go about doing it conscientiously? As a teacher volunteering at a clinic in Bolivia, I've had the chance to think about this in a new way. I don't pretend to have all the answers, but I've been considering some guidelines that I hope to keep in mind ...