by Philip José Farmer
This one is a little better written than the first. Mark Twain and a prehistoric giant find a meteorite and built a vast metal boat, the only one on Riverworld. Still no women characters, and in my opinion, too many invented characters when he has the entirety of history to play with. The dialogue in this book is more realistic. Still, I think Farmer is one of those writers who is incapable of having characters speak in any way and with any mindset other than his, Farmer's, own. Thus there is little real ideological conflict, which is a gaping absence in a place like Riverworld.