Ditto to what fobs and rd said re library and charity shops! I'm a big fan of both. Its a great way to find out what you like without having to fork out a fortune for books you'll never finish. Also a good way to find out-of-print books.
As for my suggestions, I'd recommend the following random selection which I've enjoyed (some have already been mentioned):
J. D. Salinger - most famous book
'The Catcher in the Rye'. The only book I've read in one sitting and the only book I've read twice ... but that's the kind of devotion you can muster when you're 16. Went on to enjoy all his books but Catcher in the Rye is the best IMO.
John Grisham - cheesy courtroom dramas but great page-turners. Exception is
'A Painted House' which is a completely different kettle of fish but very good too.
'The Pelican Brief' was my inter-exam reading during my finals in college. Great escapism.
Ben Elton - cheesy humourous page-turners
Oscar Wilde - not at all heavy going and often very funny (witty?). The plays are surprisingly easy to read too - and I was always a bit of a dunce in English class so I'm not a particular fan of reading plays.
John Irving - just really enjoyed pretty much all of his books. 'Gripping reads' as the dust-jackets would say.
Leslie Thomas - Sometimes its hard to separate your enjoyment of a book from your state of mind when you were reading it but Leslie Thomas has provided me with several enjoyable holiday reads including
'The Adventures of Goodnight and Loving' and
'Arrivals and Departures'
Arthur Hailey - for a read that's cheesier than a four-cheese pizza doing the backstroke in a cheese fondue then give any of Arthur Hailey's novels a whirl - I couldn't read
'Airport' without picturing scenes from the flick 'Airplane' ... "This woman has to be gotten to a hospital!" "A hospital? What is it?" "It's a big building with patients but that's not important right now".
Joseph O'Connor - The
'Irish Male' books. More journalistic humour. Possibly a bit dated now? But I enjoyed them.
My most recent read was non-fiction,
'Stiff: The Curious Life of Human Cadavers' by
Mary Roach which I highly recommend ... but not if you're squeamish.