What I read...
The Brief Wondrous Life of Oscar Wao by Junot Diaz
I loved this but it isn't really poolside reading. I don't think I did it justice, because I was putting it down and picking it up and splashing water all over it and getting distracted by waiters with pina coladas. It deserves better treatment, like a quiet afternoon on the couch with a cup of tea.
The Boleyn Inheritance by Phillipa Gregory
This is not fine literature but it's addictive, particularly if you are an avid historical fiction fan like I am. Start with The Other Boleyn Sister (I'd already read it).
Towards Zero by Agatha Christie
I love the Dame. This was a re-read for me (I've read every single mystery she's ever written) but I found it for a buck at a used book store and I needed back up material. Perfect escapist fun.