Out on Blue Six — Ian McDonald

It's hundreds of years in the future and the world is perfect. Total fulfillment and happiness are the official goals of the Compassionate Society, and any citizens who find themselves less than delighted are guilty of a PainCrime.
Cartoonist Courtney Hall is trying to find her true place in a society whose computers and projections have assigned a happy life to everyone. Yet when one of her political cartoons runs afoul of the Ministry of Pain, Courtney finds herself a fugitive from justice-and a target of the omniscient Love Police.

Her only escape is to drop through a manhole into a strange underground of discontent, a labyrinth of nests and tunnels beneath the surging metropolis. Now in a counterworld of orgasm junkies and blochip-implanted raccoons, a solitary rebel dreams of finding the edge. A visionary portrait of a unique and sinister future-illuminated with a brilliant spark of hope.