I'll second some of these already suggested - Stieg Larsson's trilogy was interesting. It was a little slow to get into at first, but once the action picked up I enjoyed them.
The Sookie Stackhouse series is good for quick, fluffy reads and has about 10 books. They're definitely not literary masterpieces and I find that they're more tongue-in-cheek and less dark than the HBO TV version, True Blood. I can usually pick up one of these books and finish it within a day or two. If you don't have an e-reader, another benefit is that these are small paperbacks so they won't take up a lot of luggage weight.
If you want something that is very light, hilarious and easy to pick up and put down, I would start reading the Janet Evanovich Series. It starts with "One For The Money" and is currently on #17. I always pick up a new Evanovich for our trip to Couples!
I love Evanovich too- not high brow reading, but great for the beach.