This is such a great question. There are about a million authors I would like to hang out with. There was one though that I thought would be perfect to hang out with. The author I would want to hang out with most would have to be Beth Revis, author of the Across the Universe Series.
I just think she is such a cool person and an amazing author. I would love just to go have lunch or dinner to pick her brain about her series and anything else she is interested in. I love her blog and reading about all the cool stuff she gets to do. It would be amazing to get to hang out with her and her great personality.
Let me know in the comments what author you would like to hang out with.