Unbreak My Heart by Melissa Walker
Okay, I think the heat is beginning eat at me...all the covers that are light with lots of water are starting to stand out to me, and when I go to describe them, the words that come to mind are cool and refreshing. (It's going to be a long summer.)
Seriously, though, this is a pretty cover. The picture is pretty, and I love how much of the landscape you can see. And look at the heart overlay! That's a really cool effect, especially since it works so well with the title.