Need Help on the title of an Old Movie Please Help!?

I am 19 now and when I was little I used to watch Swiss family Robinsons at my Grandmothers all the time, we also watched another old movie, but I can remember the title of it for the life of me its been so long I can only remember a few parts so here they are. It is about a Teenage boy who leaves his tribe for... show more I am 19 now and when I was little I used to watch Swiss family Robinsons at my Grandmothers all the time, we also watched another old movie, but I can remember the title of it for the life of me its been so long I can only remember a few parts so here they are. It is about a Teenage boy who leaves his tribe for some reason and makes a boat with a balance on the side of the boat/canoe and then gets stuck on some Island and he makes goggles from some part of a sea turtle bones I think he finds dead on the beach. and one time when he is in the water he kills a Big Eel by wrapping his shirt around his arm and then spearing it. I know these are vague parts but does any one know what movie I am talking about??! It is not Blue Lagoon or The Silent One THanks!
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