I highly recommend the book of the same title—a collection of her essays. I read it year or two ago, and it's excellent: gorgeous writing, and definitely a touchstone of the time. "I think we are well advised to keep on nodding terms with the people we used to be, whether we find them attractive company or not," from "On Keeping a Notebook," is something I think about a lot.

The essay itself is, of course, fantastic, but I find that, although she specifically tells us not to, it is impossible not to dwell on young children taking acid.