This Is What Happy Looks Like by Jennifer E. Smith
This cover is just so fun it's impossible not to love!
I like how everything in the design is leading us to the image of the couple. The sun rays work as a frame around them and the title is arranged almost like a giant arrow pointing up toward the boat. I also really like the hand drawn feel of the sunbeams and font, it helps to give it more personality.
I just can't look at this cover without smiling =)