The Center for Ventures in Girls Education based in Wellesley, Massachusetts is a program designed to help teenage girls keep their self-esteem. And as guest host Laura Knoy discovered, its organizers believe one of the keys to self- reliance lies in the outdoors. About 30 girls from metropolitan Boston journeyed to Sandwich, New Hampshire for the first week of a two year long commitment in which they experience the challenges, fears, and pleasures of close contact with Mother Nature.