Tom McCurdy said:
What book should I read for pleasure... that's not too large hopefully about either String theory or LQG. I have already read the Elegant Universe. I have to read a book for class.
the only thing I can think of the might fill the bill is Brian Greene's
latest
I remember you enjoyed "Elegant"
so you like his style and can read the next book for pleasure
it should be an easy read, compared with books about LQG I can think of,
it is about String (thus hits one of your two targets)
you can read it for class, and do a book report that both the teacher and some other students will understand
so it seems like the only choice.
I can't give a direct recommendation because i haven't read any Brian Greene.
If you want something less usual, there are two books by Lee Smolin:
The Life of the Cosmos
Three Roads to Quantum Gravity
either would probably fill the bill and you might get some new ideas in the bargain