Cabin Pressure by Josh Wolk.

This guy I admire.
He was 34 years old gettting married for the first time.
Nintey days before the wedding he decides to travel back in time 15-20 years and do one last stint as a Camp Counselor in Nothern New England.
The book is short excerpts of his summer of freedom before marriage.
He is a writer for Entertainment Weekly and dabbles in blogosphere.

It is a good read and makes me want to do something spontaneous.