Summer Reading

My wife and I are going away tomorrow. She'll be working, and I'll sort of be on vacation for a few days. So, midway through my first Harry Potter book, I'm not sure what else to bring along to read. I'll probably be almost finished with Sorcerer's Stone by the time we land in Florida, so I have to bring another novel or nonfiction work. But I'm also planning to work on a project that has an August 10 deadline. I've got a few hours yet to decide what my other book will be. What would you decide?