For a fitness-oriented trip with an eco-positive spin, go to Cotopaxi National Park and the Condor Biosphere with Adventure Life, a Quito-based environmental voluntourism company. This 5-day group service project in Ecuador’s highlands combines activities like trail work, mountain biking, horseback riding, and tree planting. (Basically, you get to preserve nature and do cool extreme sports at the same time.) And if 5 days sounds too short, sign up for a 3-day service project extension, which will take you into rural schools or back out on the trails. ($930; adventure-life.com)
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