Students dedicating their time off to working with communities in need bucks the labels and stereotypes of selfishness thrown at young people. And it’s part of a larger trend in the United States that’s slowly grown over the past 25 years: students using time off to serve in a way that builds community engagement, empathy, and leadership...

...“The work they’ve done in two days would take us about 1-1/2 or two weeks to complete,” says Antonio Bulnes, a reserve staff member working with the students. The nongovernmental organization Para La Naturaleza, which manages the reserve, has a goal of planting 1 million trees in the wake of the storm. “Since María, we’ve needed more help than usual,” says Mr. Bulnes.