At some point recently (last weekend?), I went to an amazing bookstore for children, called Books of Wonder. They have pretty much any children's book you could want, as well as some young adult ones. There is also a little bakery in one corner of the store.
I noticed one young adult author with three titles: Stephanie Perkins, whose books are Anna and the French Kiss, Lola and the Boy Next Door, and Isla and the Happily Ever After. I started with Isla and now I'm reading Anna. These books are so fun. The characters are lively and well drawn, and you get to go to France! I recommend them.