Not a day goes by without being confronted, one way or the other, with the multiple environmental, societal, and economic challenges that our planet faces. Because it is impossible to tackle all problems at once, the United Nations (UN) has created so-called international observances—special days, weeks, months, years, and even decades that highlight an issue of global concern. The year 2017 happens to be the “International Year of Sustainable Tourism for Development” (#IY2017). The idea to use tourism as a tool for development is not new. So, why this theme, and why now?