The Nature Conservancy has called Block Island "one of the last great places in the Western Hemisphere." Who'd want their mani-pedi habit messing that up? At Koru Eco Spa, owner Lauren von Bernuth strives to lessen her spa's environmental impact, conserving water, supplying staff with organic cotton uniforms, and favoring local and natural treatment ingredients, such as soy-based Priti nail polish and lavender and honey harvested right on the island. Koru Eco Spa, 232 Water Street, Block Island, 401-466-2308, koruecospa.com.