Monument [Book Club Edition] Hardcover – January 1, 1974 by Lloyd Biggle Jr.
 
A nondescript spacer with little education named Cerne Obrien finds a cache of extremely valuable "retron crystals", but crashes on an idyllic planet before he can sell them. The planet has a single continent, inhabited by humans with a Polynesian culture. The natives live contented lives, hunting a horrific sea-creature called the koluf, which constitutes almost their entire diet. Obrien uses his surviving technology to rid the area of several pests, and eventually marries. The natives come to call him the "Langri", a title of deep respect. Obrien lives a peaceful life, watching his descendants grow up, but when he realizes he is getting old....