It is not often that you see a Nobel-winner physicist behaving the way Feynman did, with such humour mixed with an obviously enormous amount of knowledge. Feynman was no ordinary physicist and no ordinary citizen, a rebel who could not be forced to behave like many around him.
This is probably the first Feynman book you should read, and it is indeed a book that anyone interested in science with a touch of good humour MUST read. While I am definitely not a fan of those "just read it" reviews, if you are still questioning if Feynman's thoughts are worth your money, I have to say "think no more, and go for it"
I strongly suggest getting "What do you care what other people think"? in the same amazon order so you can read it right after. It is a book which basically shares the same type of structure, but includes more thoughts on Feynman's youth, and a more emotional story about his first wife Arlene. Both titles are full of wisdom and fun. A good 3 rd title is "Most of the good stuff". It might be useful to mention that these titles often appear to have no chronological order, and the new Feynman reader might be left somewhat confused about when and why the events where happening. That is why you should also get the excellent biography of Feynman, "Genius", by James Gleick, which will definitely solve that problem.
For those who are worried about any massive amount of math and physics, fear not. That is obviously part of Feynman's work, but it is not essential for the books I mentioned. (But it is true that knowledge of the 2 subjects will probably make some thoughts more understandable. When it comes to math I often know what Feynman is talking about, as I had several years of nasty math classes in college, but when he is lost in his world of high physics, I am often left scratching my head...)
Unique moments from the life of a unique man. Highly recommended!