After more than three days of hiking, canoeing and other outdoor activities, a naturist/nudist outing concluded yesterday with a large boner. 'By the time the retreat had ended, there were lots of tired people, worn out from a long weekend of fun but strenuous activity,' said Dale Pursner, tour leader for the Southern Exposure Naturist Getaways outing. 'There also were a lot of stiffies.' 