Visit a Maine harbor and visitors are likely to see nattily dressed yachters walking the same jetty as a salty lobster-boat crew. Though visitors might expect friction between such different sorts, they seem to coexist in a peaceful, and sometimes even friendly, manner. The state's jagged shoreline containes high cliffs pounded by whitecaps, calm harbors surrounded by 200-year-old houses, forested islands and picturesque lighthouses. There are other kinds of natural beauty to behold in the state -- great pine forests inland lakes and mountains, rare wildlife and white-water rivers -- and many of them, we think, are underappreciated.