No offense intended here to @Brick In The Wall
I highly caution against Alan Watts. Having studied Buddhism for awhile from reputable teachers like Bikkhu Bodhi, I listened to some of Watt's stuff on Buddhism and he played fast and loose with the doctrine. So I did some research on him, and he himself claimed to be a "spiritual entertainer," not a reliable expert or guru.
I liken his work to disinformation, there's enough truth sprinkled in to make him believable, but whatever his agenda, it seems to me he was charismatic and highly intelligent, but more concerned with being influential than factual, instructive, or genuinely helpful.