Alice in Wonderland is a good light read. A couple of my friends took my advice, and they really enjoyed it. It really isn't a kids' book: they would not comprehend and or appreciate some of the humor in it.
I'm still plodding through Game of Thrones (book 3) Land of Ice and fire. Maybe not the best size book to take on holiday though. PD James books are good. I've got a few waiting to be read but the above is taking ages to finish.
Harlen Coben and Lee Child are good authors.