Simon respects and appreciates the island for itself. He sees it as a place of great natural beauty; a place of peace and repose. Probably for the first time in his life, Simon's found a place where he can feel at home, at one with his immediate surroundings. A gentle, unassertive soul, Simon is very much a child of nature, and blends right into the natural environment in a way that sets him even further apart from the other boys.
Jack, on the other hand, sees things differently. For him, the island is just an object; something to be explored, controlled, and exploited for its natural resources. His attitude towards nature is one of disrespect; he regards it as having no innate value. It exists purely to serve man's needs, to be bent towards his will. Jack sees the island as a means to an end, whether it's the killing of pigs or the killing of Piggy. All that matters is that it provides him with the resources necessary to grab, maintain, and consolidate absolute power over the other boys.