Relic

Ruslan is the last human survivor. Having been rescued by the Myssari, he is resigned to spending the rest of his long life with them, being treated very well, but no less a specimen of his doomed race for all that, as he reminds the reader at least once in nearly every chapter. For all its repetitiveness on this subject, this is good science fiction. It's got everything from technology and alien worlds and cultures (and clashes), and the ultimate question of whether humanity can be resurrected will keep you reading until the very end.