Twilight!
Seriously, don't. Ever.
I'd highly recommend The Golden Compass trilogy, if you haven't read it yet. The Enchanted Forest Chronicles is a great series too; one that I'm just finishing myself. If you want something a little heavier, I was incredibly impressed with Lucifer's Hammer, by Larry Niven.
The atoms that make up you and me were born in the hearts of suns many times greater than ours, and in time our atoms will once again reside amongst the stars. Life is but an idle dalliance of the cosmos, frail, and soon forgotten. We have been set adrift in an ocean whose tides we are only beginning to comprehend and with that maturity has come the realization that we are, at least for now, alone. In that loneliness, it falls to us to shine as brightly as the stars from which we came.