Interview with the Vampire by Anne Rice, wickedly fun
The Miser (play) by Moliere (great, great stuff, oops, I need to change my hat...)
Do Androids Dream of Electric Sheep? by Philip K. Dick (Novella, the basis for Blade Runner. Ask yourself if Decker is a replicant, he does and the answer, or lack of an answer, is troubling)
The Stainless Steel Rat (series) by Harry Harrison
Bill the Galactic Hero by Harry Harrison (especially good for those who remember the days of the Vietnam War).
Starship Troopers by Robert Heinlein - more acidic than one might expect
The Moon is a Harsh Mistress by Robert Heinlein
The Three Musketeers by Alexander Dumas the younger - One of my all-time favorite works.
Ivanhoe by Sir Walter Scott, adventurous fun.
John Carter of Mars (series) by Edgar Rice Burroughs - great fun, little depth
James Bond (the books) by Ian Flemming - don't bother with the movies, read the books, which are very different. Beware the racial overtones of the era, though.
The Flashman Papers (series) by George MacDonald Fraser. If you like irreverent historical fun, do not miss the chance to read these works. These pieces are uproarious!
Horatio Hornblower (series) by C.S. Forester. Fun and adventure on the high seas.
The Lord of the Rings (trilogy) by J.R.R. Tolkien
Man and Superman (play) by George Bernard Shaw (pay special attention to Don Juan in Hell!)
"In the Penal Colony" (short story) by Franz Kafka ... grim deeds ...
The Heart of Darkness (novella) by Josef Konrad ... don't just watch Apocolypse Now, read this then watch