Reddit reviews Riverworld: Including To Your Scattered Bodies Go & The Fabulous Riverboat (Riverworld (1))

• Dune by Frank Herbert.
  
  
• Riverworld by Philip Jose Farmer - somewhat of a longshot, but something made me think of it.
  
  
• Brave New World by Aldous Huxley.
  
  
• Ender's Game by Orson Scott Card.
  
  
• Battle Royale by Koushun Takami.
  
  
• Ready Player One by Ernest Cline.
  
  
• Atlas Shrugged by Ayn Rand .
  
  
• Neuromancer by William Gibson.
  
  
• The Running Man by Stephen King.
  
  You might even get a kick out of The Hunger Games or Divergent... And of course 1984 :)

Actually the closest thing I could find was in a collection by Philip José Farmer called Riverworld

I'd put down my copy of Riverworld and relax in the sun.

Or possibly this one?

Here are some fantasy/sci-fi books that I liked at that age, or would have liked had they been published. A couple of them have some sexual content, but nothing overly detailed.

DEFINITELY "The Dark is Rising" series. They're short, but excellent. Also The Hunger Games is a good bet (never read the sequels, but that first book is great). Other suggestions: The Name of the Wind, Waylander, Rose of the Prophet, 1984, To Your Scattered Bodies Go, The Strain, any of the Dragonlance books (I would start at the beginning, with Dragons of Autumn Twilight), or nearly anything by Stephen King.

Fear not, for we shall meet again on Riverworld!