This 20-year-old eco-resort is a pioneer in sustainable tourism, drawing electricity from photovoltaic power and collecting (and filtering) water in cisterns. Shower tanks are solar-heated, and eco-tents use composting toilets. But most don’t stay here to be virtuous, they do so because the views are wonderful (Concordia’s elevated structures cling to 50 acres of cliffside), the staff lovely and the prices reasonable (for St. John). Doubles come in a range of lodging styles, from eco-tents to full-kitchen lofts to resort-style studios. The wood-framed, soft-sided eco-tents (and premium eco-tents) are set on the hillsides and have a treehouse feel, with cooling breezes (no A/C, of course) and those phenomenal views. Eight new eco-studios sleep four each with a queen bed and a queen futon. Some units come with full kitchens.