The Electric Kool-Aid Acid Test by Tom Wolfe

This is the seminal work on the hippie culture, a report on what it was like to follow along with Ken Kesey and the Merry Pranksters as they launched the "Transcontinental Bus Tour" from the West Coast to New York, all while introducing acid (then legal) to hundreds of like-minded folks, staging impromptu jam sessions, dodging the Feds, and meeting some of the most revolutionary figures of the day.