I am Number Four by Pittacus Lore- I actually read this one on the beach! It was summer a year or two ago...:)
Heist Society by Ally Carter
Artemis Fowl by Eoin Colfer
Sweethearts by Sara Zarr (my review)
The Princess Diaries by Meg Cabot
Harry Potter by JK Rowling- in all fairness, I'm biased. I could read this anywhere.
Percy Jackson- also.
The Bane Chronicles- can I call these their own books? You can read them independently of TMI. Very cute and funny (at least the first two), they'd make a great beach read.
Oh My Gods by Tera Lynn Childs- light and cute spin on high school and Greek mythology
Extras by Scott Westerfeld- in huge contrast to the rest of The Uglies series, it isn't dark and suspenseful, perfect for a sunny day out. (my review)
Between the Lines by Jodi Picoult- sun, sand, sea. What more do you need? Why, fairy tale prince come to life, of course! (my review)
So these are my picks! What are yours?
Love, Esty :)