This book has been recommended for ages 12 and up. I would love to recommend it to everyone as well, but it does some very mild sex conversations.
Take a look at the Cayman Summer blog. It has some beautiful pictures of an underwater excursion as well as some other things. There is also a contest going on that you can participate in.
Here's a blurb about the book:
Michael's parents died in a terrible storm and now he's drowning in tragedy. All Leesie wants to do is save him. But if she gives into temptations, who will save her?