If you want light summer reading, I highly recommend anything by Marian Keyes ("Watermelon", in particular, is my fave by her). I also like Nora Roberts for a quick, well done romance, though she does get a bit formulaic if you read a bunch of them. My favorites by her are the more "supernatural" ones, like the In The Garden Trilogy (Blue Dahlia, Black Rose, Red Lily).
My all time favorite, if you've never read it, is The Bridges of Madison County. Fantastic story.
I just finished reading a couple by Joyce Magnin - The Prayers of Agnes Sparrow and Charlotte Figg Takes Over Paradise. Both small-town type stories, which I enjoy.
Some of my other favorites, but not so lighthearted:
The Glass Castle, by Jeanette Walls
Me and Emma, by Elizabeth Flock (This one is very moving and shocking)
The Mercy of Thin Air, by Ronlyn Dominique
Anything by Anita Shreve, particularly Fortunes Rocks
Anything by Maeve Binchy, particularly Light a Penny Candle
A couple of really good biographies:
A Girl Named Zippy
and
She Got Up Off The Couch, both by Haven Kimmel
My "guilty pleasure" is young adult books.
Beautiful Creatures
Beautiful Darkness
Beautiful Chaos, all by Kami Garcia and Margaret Stohl
The Night Circus, by Erin Morganstern
A Great and Terrible Beauty
Rebel Angels
The Sweet Far Thing, all by Libba Bray
Ok, I'll stop there, because I could go on and on for days!