
One of my favourites was Reunion (Reencuentro in Spanish), by Fred Uhlman. I strongly recommend it.
Outsiders (Rebeldes in Spanish), by Susan E. Hinton is a book I'll never forget. It was a present for my 15th birthday and I still have it!
The first book I read in only one day was Love Story, by Erich Segal. If you like love stories, you shouldn't miss this one! And make sure you have a box of Kleenex handy!