A World Out of Time
by Larry Niven
Classic SF. While a few of the concepts of the future world are a bit dated (though one could argue that as most of the story is from the perspective of a man who died in the 1970's) it overall is an interesting romp that covers an impressive scope of time (not just throwing us hundreds of years into the future, but millions!!!).
Corbell begins this tale as a corpsicle, frozen on the off chance getting revived in the future. And lucky for him he does... sorta. Waking up in a new body he finds he is merely fodder for the "State", his old body is ground up to extract his memories and tied into a body of a criminal who has been wiped. Slated to be a operator of a ramscoop ship, he eventually has his own ideas and ends up hijacking it and eventually returning to the Earth 3 million years after he left. Afterward he spends the rest of the book on the prowl for a special treatment that will make him young again.
