Greg Mankiw and Arnold Kling have posted suggestions of books for economics undergrads to read at the beach this summer. Since they include mostly books I haven't read, I'll need to update my wishlist.
I added a couple books I thought would be good for the beach in Kling's comments:
In addition to the required readings for Mises University, I'm going to try to get through a bunch of books I've bought recently:
The state is that great fiction by which everyone tries to live at the expense of everyone else. - Frederic Bastiat