Shadow and Bone by Leigh Bardugo
Love love loving this book. I started it yesterday and I'm already over halfway through (though the whole reading on the beach all day thing helps with that).
Write Your Novel In A Month by Jeff Gerke
Jeff Gerke's books about writing are always extremely informative and helpful. I'm also rereading his book, Plot Versus Character, at the moment.
Prince Caspian by C.S. Lewis (audio)
This is great for when I'm lying on the beach and just want to close my eyes and read at the same time.