Prefix+Island+and+the+Conversion+Canoe+2

A guy regains consciousness on a deserted island. He doesn't know who he is or how he got there, but he has a large bump on his head. He finds he has a spyglass so he thinks he is a pirate. He survives on coconuts and limpets. He occupies himself by collecting plastic that floats up on the beach to protect the sea life. After a few years he uses a lens from his spyglass to melt the plastic bags together to make a canoe shaped plastic bag and then he stuffed it with coconut fibers. He sets to sea and finds his little island is in the middle of a chain of seven islands with friendly natives. The natives use coconut fibers to make everything, so he is a rich man due to his years of eating coconuts.